31031310009 has 48 divisors (see below), whose sum is σ = 51150548736. Its totient is φ = 16627161600.

The previous prime is 31031310007. The next prime is 31031310049. The reversal of 31031310009 is 90001313013.

It is not a de Polignac number, because 31031310009 - 2¹ = 31031310007 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (31031310007) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 654319 + ... + 700139.

It is an arithmetic number, because the mean of its divisors is an integer number (1065636432).

Almost surely, 2^31031310009 is an apocalyptic number.

It is an amenable number.

31031310009 is a deficient number, since it is larger than the sum of its proper divisors (20119238727).

31031310009 is a wasteful number, since it uses less digits than its factorization.

31031310009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46126 (or 46119 counting only the distinct ones).

The product of its (nonzero) digits is 243, while the sum is 21.

The spelling of 31031310009 in words is "thirty-one billion, thirty-one million, three hundred ten thousand, nine".