31020540051 has 4 divisors (see below), whose sum is σ = 41360720072. Its totient is φ = 20680360032.

The previous prime is 31020540049. The next prime is 31020540071. The reversal of 31020540051 is 15004502013.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 31020540051 - 2¹ = 31020540049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31020540071) 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, 5170090006 + ... + 5170090011.

It is an arithmetic number, because the mean of its divisors is an integer number (10340180018).

Almost surely, 2^31020540051 is an apocalyptic number.

31020540051 is a deficient number, since it is larger than the sum of its proper divisors (10340180021).

31020540051 is a wasteful number, since it uses less digits than its factorization.

31020540051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10340180020.

The product of its (nonzero) digits is 600, while the sum is 21.

The spelling of 31020540051 in words is "thirty-one billion, twenty million, five hundred forty thousand, fifty-one".