31345644881 has 4 divisors (see below), whose sum is σ = 31346072064. Its totient is φ = 31345217700.

The previous prime is 31345644853. The next prime is 31345644887. The reversal of 31345644881 is 18844654313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31345644881 - 2⁶ = 31345644817 is a prime.

It is a super-3 number, since 3×31345644881³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31345644887) 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, 72425 + ... + 260646.

It is an arithmetic number, because the mean of its divisors is an integer number (7836518016).

Almost surely, 2^31345644881 is an apocalyptic number.

It is an amenable number.

31345644881 is a deficient number, since it is larger than the sum of its proper divisors (427183).

31345644881 is an equidigital number, since it uses as much as digits as its factorization.

31345644881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427182.

The product of its digits is 1105920, while the sum is 47.

The spelling of 31345644881 in words is "thirty-one billion, three hundred forty-five million, six hundred forty-four thousand, eight hundred eighty-one".