85039512631 has 4 divisors (see below), whose sum is σ = 86433603064. Its totient is φ = 83645422200.

The previous prime is 85039512611. The next prime is 85039512647. The reversal of 85039512631 is 13621593058.

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 85039512631 - 2¹³ = 85039504439 is a prime.

It is a super-2 number, since 2×85039512631² (a number of 23 digits) 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 (85039512611) 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, 697045125 + ... + 697045246.

It is an arithmetic number, because the mean of its divisors is an integer number (21608400766).

Almost surely, 2^85039512631 is an apocalyptic number.

85039512631 is a deficient number, since it is larger than the sum of its proper divisors (1394090433).

85039512631 is a wasteful number, since it uses less digits than its factorization.

85039512631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1394090432.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 85039512631 in words is "eighty-five billion, thirty-nine million, five hundred twelve thousand, six hundred thirty-one".