315252201581 has 2 divisors, whose sum is σ = 315252201582. Its totient is φ = 315252201580.

The previous prime is 315252201569. The next prime is 315252201599. The reversal of 315252201581 is 185102252513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201878577481 + 113373624100 = 449309^2 + 336710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315252201581 is a prime.

It is a super-2 number, since 2×315252201581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315252201541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157626100790 + 157626100791.

It is an arithmetic number, because the mean of its divisors is an integer number (157626100791).

Almost surely, 2^315252201581 is an apocalyptic number.

It is an amenable number.

315252201581 is a deficient number, since it is larger than the sum of its proper divisors (1).

315252201581 is an equidigital number, since it uses as much as digits as its factorization.

315252201581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24000, while the sum is 35.

The spelling of 315252201581 in words is "three hundred fifteen billion, two hundred fifty-two million, two hundred one thousand, five hundred eighty-one".