61885431 has 8 divisors (see below), whose sum is σ = 91682160. Its totient is φ = 41256936.

The previous prime is 61885379. The next prime is 61885459. The reversal of 61885431 is 13458816.

61885431 is a `hidden beast` number, since 618 + 8 + 5 + 4 + 31 = 666.

It is not a de Polignac number, because 61885431 - 2¹⁵ = 61852663 is a prime.

It is a super-2 number, since 2×61885431² = 7659613140111522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61885231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1146000 + ... + 1146053.

It is an arithmetic number, because the mean of its divisors is an integer number (11460270).

Almost surely, 2^61885431 is an apocalyptic number.

61885431 is a deficient number, since it is larger than the sum of its proper divisors (29796729).

61885431 is a wasteful number, since it uses less digits than its factorization.

61885431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2292062 (or 2292056 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 61885431 is about 7866.7293712190. The cubic root of 61885431 is about 395.5452194196.

The spelling of 61885431 in words is "sixty-one million, eight hundred eighty-five thousand, four hundred thirty-one".