215319406813 has 4 divisors (see below), whose sum is σ = 246079322080. Its totient is φ = 184559491548.

The previous prime is 215319406787. The next prime is 215319406817. The reversal of 215319406813 is 318604913512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 215319406813 - 2²⁵ = 215285852381 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215319406813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215319406817) 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, 15379957623 + ... + 15379957636.

It is an arithmetic number, because the mean of its divisors is an integer number (61519830520).

Almost surely, 2^215319406813 is an apocalyptic number.

It is an amenable number.

215319406813 is a deficient number, since it is larger than the sum of its proper divisors (30759915267).

215319406813 is an equidigital number, since it uses as much as digits as its factorization.

215319406813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30759915266.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 215319406813 in words is "two hundred fifteen billion, three hundred nineteen million, four hundred six thousand, eight hundred thirteen".