31531145053 has 2 divisors, whose sum is σ = 31531145054. Its totient is φ = 31531145052.

The previous prime is 31531145017. The next prime is 31531145059. The reversal of 31531145053 is 35054113513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19435984569 + 12095160484 = 139413^2 + 109978^2 .

It is a cyclic number.

It is not a de Polignac number, because 31531145053 - 2²⁹ = 30994274141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31531145059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15765572526 + 15765572527.

It is an arithmetic number, because the mean of its divisors is an integer number (15765572527).

Almost surely, 2^31531145053 is an apocalyptic number.

It is an amenable number.

31531145053 is a deficient number, since it is larger than the sum of its proper divisors (1).

31531145053 is an equidigital number, since it uses as much as digits as its factorization.

31531145053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13500, while the sum is 31.

Adding to 31531145053 its reverse (35054113513), we get a palindrome (66585258566).

The spelling of 31531145053 in words is "thirty-one billion, five hundred thirty-one million, one hundred forty-five thousand, fifty-three".