215125920913 has 4 divisors (see below), whose sum is σ = 217255880628. Its totient is φ = 212995961200.

The previous prime is 215125920881. The next prime is 215125920941. The reversal of 215125920913 is 319029521512.

It is a happy number.

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 113267921809 + 101857999104 = 336553^2 + 319152^2 .

It is a cyclic number.

It is not a de Polignac number, because 215125920913 - 2⁵ = 215125920881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215125920943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1064979706 + ... + 1064979907.

It is an arithmetic number, because the mean of its divisors is an integer number (54313970157).

Almost surely, 2^215125920913 is an apocalyptic number.

It is an amenable number.

215125920913 is a deficient number, since it is larger than the sum of its proper divisors (2129959715).

215125920913 is a wasteful number, since it uses less digits than its factorization.

215125920913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129959714.

The product of its (nonzero) digits is 48600, while the sum is 40.

The spelling of 215125920913 in words is "two hundred fifteen billion, one hundred twenty-five million, nine hundred twenty thousand, nine hundred thirteen".