31051589881 has 4 divisors (see below), whose sum is σ = 33440173732. Its totient is φ = 28663006032.

The previous prime is 31051589873. The next prime is 31051589909. The reversal of 31051589881 is 18898515013.

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 5382423225 + 25669166656 = 73365^2 + 160216^2 .

It is a cyclic number.

It is not a de Polignac number, because 31051589881 - 2³ = 31051589873 is a prime.

It is a super-2 number, since 2×31051589881² (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 (31051589081) 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, 1194291906 + ... + 1194291931.

It is an arithmetic number, because the mean of its divisors is an integer number (8360043433).

Almost surely, 2^31051589881 is an apocalyptic number.

It is an amenable number.

31051589881 is a deficient number, since it is larger than the sum of its proper divisors (2388583851).

31051589881 is a wasteful number, since it uses less digits than its factorization.

31051589881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2388583850.

The product of its (nonzero) digits is 345600, while the sum is 49.

The spelling of 31051589881 in words is "thirty-one billion, fifty-one million, five hundred eighty-nine thousand, eight hundred eighty-one".