315516424220251 has 4 divisors (see below), whose sum is σ = 315516476088592. Its totient is φ = 315516372351912.

The previous prime is 315516424220243. The next prime is 315516424220329. The reversal of 315516424220251 is 152022424615513.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 315516424220251 - 2³ = 315516424220243 is a prime.

It is a super-2 number, since 2×315516424220251² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 315516424220198 and 315516424220207.

It is not an unprimeable number, because it can be changed into a prime (315516424920251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15377151 + ... + 29453176.

It is an arithmetic number, because the mean of its divisors is an integer number (78879119022148).

Almost surely, 2^{315516424220251} is an apocalyptic number.

315516424220251 is a deficient number, since it is larger than the sum of its proper divisors (51868341).

315516424220251 is an equidigital number, since it uses as much as digits as its factorization.

315516424220251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51868340.

The product of its (nonzero) digits is 576000, while the sum is 43.

Adding to 315516424220251 its reverse (152022424615513), we get a palindrome (467538848835764).

The spelling of 315516424220251 in words is "three hundred fifteen trillion, five hundred sixteen billion, four hundred twenty-four million, two hundred twenty thousand, two hundred fifty-one".