31122052513 has 2 divisors, whose sum is σ = 31122052514. Its totient is φ = 31122052512.

The previous prime is 31122052501. The next prime is 31122052517. The reversal of 31122052513 is 31525022113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23872722064 + 7249330449 = 154508^2 + 85143^2 .

It is a cyclic number.

It is not a de Polignac number, because 31122052513 - 2²⁵ = 31088498081 is a prime.

It is not a weakly prime, because it can be changed into another prime (31122052517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561026256 + 15561026257.

It is an arithmetic number, because the mean of its divisors is an integer number (15561026257).

Almost surely, 2^31122052513 is an apocalyptic number.

It is an amenable number.

31122052513 is a deficient number, since it is larger than the sum of its proper divisors (1).

31122052513 is an equidigital number, since it uses as much as digits as its factorization.

31122052513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 31122052513 its reverse (31525022113), we get a palindrome (62647074626).

The spelling of 31122052513 in words is "thirty-one billion, one hundred twenty-two million, fifty-two thousand, five hundred thirteen".