85905731 has 4 divisors (see below), whose sum is σ = 85980264. Its totient is φ = 85831200.

The previous prime is 85905697. The next prime is 85905763. The reversal of 85905731 is 13750958.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85905731 is a prime.

It is a super-2 number, since 2×85905731² = 14759589237288722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85905031) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 35510 + ... + 37851.

It is an arithmetic number, because the mean of its divisors is an integer number (21495066).

Almost surely, 2^85905731 is an apocalyptic number.

85905731 is a deficient number, since it is larger than the sum of its proper divisors (74533).

85905731 is a wasteful number, since it uses less digits than its factorization.

85905731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74532.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 85905731 is about 9268.5344580468. The cubic root of 85905731 is about 441.2391567233.

The spelling of 85905731 in words is "eighty-five million, nine hundred five thousand, seven hundred thirty-one".