61171020 has 36 divisors (see below), whose sum is σ = 185552640. Its totient is φ = 16312224.

The previous prime is 61171009. The next prime is 61171031. The reversal of 61171020 is 2017116.

61171020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (61171009) and next prime (61171031).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 61170984 and 61171002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 169740 + ... + 170099.

It is an arithmetic number, because the mean of its divisors is an integer number (5154240).

Almost surely, 2^61171020 is an apocalyptic number.

61171020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61171020 is an abundant number, since it is smaller than the sum of its proper divisors (124381620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61171020 is a wasteful number, since it uses less digits than its factorization.

61171020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339854 (or 339849 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 61171020 is about 7821.1904464730. The cubic root of 61171020 is about 394.0172546920.

Adding to 61171020 its reverse (2017116), we get a palindrome (63188136).

It can be divided in two parts, 611 and 71020, that added together give a triangular number (71631 = T₃₇₈).

The spelling of 61171020 in words is "sixty-one million, one hundred seventy-one thousand, twenty".