85757431 has 4 divisors (see below), whose sum is σ = 90271000. Its totient is φ = 81243864.

The previous prime is 85757429. The next prime is 85757443. The reversal of 85757431 is 13475758.

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

It is a cyclic number.

It is not a de Polignac number, because 85757431 - 2¹ = 85757429 is a prime.

It is a super-2 number, since 2×85757431² = 14708673943439522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85757411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2256756 + ... + 2256793.

It is an arithmetic number, because the mean of its divisors is an integer number (22567750).

Almost surely, 2^85757431 is an apocalyptic number.

85757431 is a deficient number, since it is larger than the sum of its proper divisors (4513569).

85757431 is a wasteful number, since it uses less digits than its factorization.

85757431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4513568.

The product of its digits is 117600, while the sum is 40.

The square root of 85757431 is about 9260.5308163193. The cubic root of 85757431 is about 440.9851051542.

The spelling of 85757431 in words is "eighty-five million, seven hundred fifty-seven thousand, four hundred thirty-one".