215231132513 has 8 divisors (see below), whose sum is σ = 216559586568. Its totient is φ = 213906760704.

The previous prime is 215231132509. The next prime is 215231132527. The reversal of 215231132513 is 315231132512.

It can be written as a sum of positive squares in 4 ways, for example, as 4323325504 + 210907807009 = 65752^2 + 459247^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 215231132513 - 2² = 215231132509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215231432513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 914756 + ... + 1125717.

It is an arithmetic number, because the mean of its divisors is an integer number (27069948321).

Almost surely, 2^215231132513 is an apocalyptic number.

It is an amenable number.

215231132513 is a deficient number, since it is larger than the sum of its proper divisors (1328454055).

215231132513 is a wasteful number, since it uses less digits than its factorization.

215231132513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041123.

The product of its digits is 5400, while the sum is 29.

Subtracting 215231132513 from its reverse (315231132512), we obtain a palindrome (99999999999).

The spelling of 215231132513 in words is "two hundred fifteen billion, two hundred thirty-one million, one hundred thirty-two thousand, five hundred thirteen".