31112820481 has 4 divisors (see below), whose sum is σ = 31190408964. Its totient is φ = 31035232000.

The previous prime is 31112820413. The next prime is 31112820547. The reversal of 31112820481 is 18402821113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18402821113 = 17 ⋅1082518889.

It can be written as a sum of positive squares in 2 ways, for example, as 17653108225 + 13459712256 = 132865^2 + 116016^2 .

It is a cyclic number.

It is not a de Polignac number, because 31112820481 - 2¹¹ = 31112818433 is a prime.

It is a super-2 number, since 2×31112820481² (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 (31112850481) 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, 38793640 + ... + 38794441.

It is an arithmetic number, because the mean of its divisors is an integer number (7797602241).

Almost surely, 2^31112820481 is an apocalyptic number.

It is an amenable number.

31112820481 is a deficient number, since it is larger than the sum of its proper divisors (77588483).

31112820481 is an equidigital number, since it uses as much as digits as its factorization.

31112820481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77588482.

The product of its (nonzero) digits is 3072, while the sum is 31.

The spelling of 31112820481 in words is "thirty-one billion, one hundred twelve million, eight hundred twenty thousand, four hundred eighty-one".