61172120 has 32 divisors (see below), whose sum is σ = 145735200. Its totient is φ = 23029248.

The previous prime is 61172119. The next prime is 61172147. The reversal of 61172120 is 2127116.

61172120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 61172092 and 61172101.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 44300 + ... + 45659.

It is an arithmetic number, because the mean of its divisors is an integer number (4554225).

Almost surely, 2^61172120 is an apocalyptic number.

It is an amenable number.

61172120 is an abundant number, since it is smaller than the sum of its proper divisors (84563080).

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

61172120 is a wasteful number, since it uses less digits than its factorization.

61172120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89987 (or 89983 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 61172120 is about 7821.2607679325. The cubic root of 61172120 is about 394.0196164660.

Adding to 61172120 its reverse (2127116), we get a palindrome (63299236).

The spelling of 61172120 in words is "sixty-one million, one hundred seventy-two thousand, one hundred twenty".