31082638985 has 4 divisors (see below), whose sum is σ = 37299166788. Its totient is φ = 24866111184.

The previous prime is 31082638883. The next prime is 31082638987. The reversal of 31082638985 is 58983628013.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22367296249 + 8715342736 = 149557^2 + 93356^2 .

It is a cyclic number.

It is not a de Polignac number, because 31082638985 - 2¹⁶ = 31082573449 is a prime.

It is a super-2 number, since 2×31082638985² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31082638987) 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, 3108263894 + ... + 3108263903.

It is an arithmetic number, because the mean of its divisors is an integer number (9324791697).

Almost surely, 2^31082638985 is an apocalyptic number.

It is an amenable number.

31082638985 is a deficient number, since it is larger than the sum of its proper divisors (6216527803).

31082638985 is an equidigital number, since it uses as much as digits as its factorization.

31082638985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6216527802.

The product of its (nonzero) digits is 2488320, while the sum is 53.

The spelling of 31082638985 in words is "thirty-one billion, eighty-two million, six hundred thirty-eight thousand, nine hundred eighty-five".