85474942531 has 4 divisors (see below), whose sum is σ = 93245391864. Its totient is φ = 77704493200.

The previous prime is 85474942513. The next prime is 85474942547. The reversal of 85474942531 is 13524947458.

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 85474942531 - 2⁹ = 85474942019 is a prime.

It is a super-2 number, since 2×85474942531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85474912531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3885224650 + ... + 3885224671.

It is an arithmetic number, because the mean of its divisors is an integer number (23311347966).

Almost surely, 2^85474942531 is an apocalyptic number.

85474942531 is a deficient number, since it is larger than the sum of its proper divisors (7770449333).

85474942531 is a wasteful number, since it uses less digits than its factorization.

85474942531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7770449332.

The product of its digits is 4838400, while the sum is 52.

The spelling of 85474942531 in words is "eighty-five billion, four hundred seventy-four million, nine hundred forty-two thousand, five hundred thirty-one".