61871031 has 12 divisors (see below), whose sum is σ = 89940552. Its totient is φ = 40983696.

The previous prime is 61871027. The next prime is 61871039. The reversal of 61871031 is 13017816.

61871031 is a `hidden beast` number, since 618 + 7 + 10 + 31 = 666.

It is not a de Polignac number, because 61871031 - 2² = 61871027 is a prime.

It is a super-2 number, since 2×61871031² = 7656048954005922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61870986 and 61871004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61871039) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20481 + ... + 23306.

It is an arithmetic number, because the mean of its divisors is an integer number (7495046).

Almost surely, 2^61871031 is an apocalyptic number.

61871031 is a deficient number, since it is larger than the sum of its proper divisors (28069521).

61871031 is a wasteful number, since it uses less digits than its factorization.

61871031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43950 (or 43947 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 61871031 is about 7865.8140710291. The cubic root of 61871031 is about 395.5145374917.

Adding to 61871031 its reverse (13017816), we get a palindrome (74888847).

The spelling of 61871031 in words is "sixty-one million, eight hundred seventy-one thousand, thirty-one".