85511307531 has 8 divisors (see below), whose sum is σ = 122785467280. Its totient is φ = 52622343072.

The previous prime is 85511307499. The next prime is 85511307617. The reversal of 85511307531 is 13570311558.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 85511307531 - 2⁵ = 85511307499 is a prime.

It is a super-2 number, since 2×85511307531² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 2192597629 = 85511307531 / (8 + 5 + 5 + 1 + 1 + 3 + 0 + 7 + 5 + 3 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85511307531.

It is not an unprimeable number, because it can be changed into a prime (85511307131) 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, 1096298776 + ... + 1096298853.

It is an arithmetic number, because the mean of its divisors is an integer number (15348183410).

Almost surely, 2^85511307531 is an apocalyptic number.

85511307531 is a deficient number, since it is larger than the sum of its proper divisors (37274159749).

85511307531 is a wasteful number, since it uses less digits than its factorization.

85511307531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2192597645.

The product of its (nonzero) digits is 63000, while the sum is 39.

The spelling of 85511307531 in words is "eighty-five billion, five hundred eleven million, three hundred seven thousand, five hundred thirty-one".