315540623129 has 2 divisors, whose sum is σ = 315540623130. Its totient is φ = 315540623128.

The previous prime is 315540623117. The next prime is 315540623219. The reversal of 315540623129 is 921326045513.

Together with next prime (315540623219) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 299734350400 + 15806272729 = 547480^2 + 125723^2 .

It is an emirp because it is prime and its reverse (921326045513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 315540623129 - 2²⁴ = 315523845913 is a prime.

It is not a weakly prime, because it can be changed into another prime (315540623929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157770311564 + 157770311565.

It is an arithmetic number, because the mean of its divisors is an integer number (157770311565).

Almost surely, 2^315540623129 is an apocalyptic number.

It is an amenable number.

315540623129 is a deficient number, since it is larger than the sum of its proper divisors (1).

315540623129 is an equidigital number, since it uses as much as digits as its factorization.

315540623129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 41.

The spelling of 315540623129 in words is "three hundred fifteen billion, five hundred forty million, six hundred twenty-three thousand, one hundred twenty-nine".