315187406993 has 4 divisors (see below), whose sum is σ = 315189191460. Its totient is φ = 315185622528.

The previous prime is 315187406987. The next prime is 315187407023. The reversal of 315187406993 is 399604781513.

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

It can be written as a sum of positive squares in 2 ways, for example, as 25417287184 + 289770119809 = 159428^2 + 538303^2 .

It is a cyclic number.

It is not a de Polignac number, because 315187406993 - 2²⁸ = 314918971537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (315187406953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 594080 + ... + 991617.

It is an arithmetic number, because the mean of its divisors is an integer number (78797297865).

Almost surely, 2^315187406993 is an apocalyptic number.

It is an amenable number.

315187406993 is a deficient number, since it is larger than the sum of its proper divisors (1784467).

315187406993 is a wasteful number, since it uses less digits than its factorization.

315187406993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784466.

The product of its (nonzero) digits is 4898880, while the sum is 56.

The spelling of 315187406993 in words is "three hundred fifteen billion, one hundred eighty-seven million, four hundred six thousand, nine hundred ninety-three".