31031009137 has 2 divisors, whose sum is σ = 31031009138. Its totient is φ = 31031009136.

The previous prime is 31031009129. The next prime is 31031009189. The reversal of 31031009137 is 73190013013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16459863616 + 14571145521 = 128296^2 + 120711^2 .

It is a cyclic number.

It is not a de Polignac number, because 31031009137 - 2³ = 31031009129 is a prime.

It is not a weakly prime, because it can be changed into another prime (31031003137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15515504568 + 15515504569.

It is an arithmetic number, because the mean of its divisors is an integer number (15515504569).

Almost surely, 2^31031009137 is an apocalyptic number.

It is an amenable number.

31031009137 is a deficient number, since it is larger than the sum of its proper divisors (1).

31031009137 is an equidigital number, since it uses as much as digits as its factorization.

31031009137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1701, while the sum is 28.

The spelling of 31031009137 in words is "thirty-one billion, thirty-one million, nine thousand, one hundred thirty-seven".