31311330051 has 4 divisors (see below), whose sum is σ = 41748440072. Its totient is φ = 20874220032.

The previous prime is 31311330047. The next prime is 31311330059. The reversal of 31311330051 is 15003311313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15003311313 = 3 ⋅5001103771.

It is not a de Polignac number, because 31311330051 - 2² = 31311330047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31311330059) 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, 5218555006 + ... + 5218555011.

It is an arithmetic number, because the mean of its divisors is an integer number (10437110018).

Almost surely, 2^31311330051 is an apocalyptic number.

31311330051 is a deficient number, since it is larger than the sum of its proper divisors (10437110021).

31311330051 is a wasteful number, since it uses less digits than its factorization.

31311330051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10437110020.

The product of its (nonzero) digits is 405, while the sum is 21.

Adding to 31311330051 its reverse (15003311313), we get a palindrome (46314641364).

The spelling of 31311330051 in words is "thirty-one billion, three hundred eleven million, three hundred thirty thousand, fifty-one".