31256820093 has 4 divisors (see below), whose sum is σ = 41675760128. Its totient is φ = 20837880060.

The previous prime is 31256820079. The next prime is 31256820137. The reversal of 31256820093 is 39002865213.

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 not a de Polignac number, because 31256820093 - 2²⁹ = 30719949181 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31256820043) 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, 5209470013 + ... + 5209470018.

It is an arithmetic number, because the mean of its divisors is an integer number (10418940032).

Almost surely, 2^31256820093 is an apocalyptic number.

It is an amenable number.

31256820093 is a deficient number, since it is larger than the sum of its proper divisors (10418940035).

31256820093 is a wasteful number, since it uses less digits than its factorization.

31256820093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10418940034.

The product of its (nonzero) digits is 77760, while the sum is 39.

The spelling of 31256820093 in words is "thirty-one billion, two hundred fifty-six million, eight hundred twenty thousand, ninety-three".