61705431 has 6 divisors (see below), whose sum is σ = 89130080. Its totient is φ = 41136948.

The previous prime is 61705411. The next prime is 61705433. The reversal of 61705431 is 13450716.

61705431 is a `hidden beast` number, since 617 + 0 + 5 + 43 + 1 = 666.

It is not a de Polignac number, because 61705431 - 2²⁵ = 28150999 is a prime.

It is a super-2 number, since 2×61705431² = 7615120429791522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61705395 and 61705404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61705433) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3428071 + ... + 3428088.

Almost surely, 2^61705431 is an apocalyptic number.

61705431 is a deficient number, since it is larger than the sum of its proper divisors (27424649).

61705431 is a wasteful number, since it uses less digits than its factorization.

61705431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6856165 (or 6856162 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 61705431 is about 7855.2804533002. The cubic root of 61705431 is about 395.1613526565.

The spelling of 61705431 in words is "sixty-one million, seven hundred five thousand, four hundred thirty-one".