213131579 has 4 divisors (see below), whose sum is σ = 214407984. Its totient is φ = 211855176.

The previous prime is 213131543. The next prime is 213131591. The reversal of 213131579 is 975131312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213131579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213131519) 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, 637952 + ... + 638285.

It is an arithmetic number, because the mean of its divisors is an integer number (53601996).

Almost surely, 2^213131579 is an apocalyptic number.

213131579 is a deficient number, since it is larger than the sum of its proper divisors (1276405).

213131579 is a wasteful number, since it uses less digits than its factorization.

213131579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276404.

The product of its digits is 5670, while the sum is 32.

The square root of 213131579 is about 14599.0266456363. The cubic root of 213131579 is about 597.3322103743.

The spelling of 213131579 in words is "two hundred thirteen million, one hundred thirty-one thousand, five hundred seventy-nine".