56639213 has 4 divisors (see below), whose sum is σ = 57956448. Its totient is φ = 55321980.

The previous prime is 56639159. The next prime is 56639227. The reversal of 56639213 is 31293665.

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 56639213 - 2⁸ = 56638957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56639243) 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, 658553 + ... + 658638.

It is an arithmetic number, because the mean of its divisors is an integer number (14489112).

Almost surely, 2^56639213 is an apocalyptic number.

It is an amenable number.

56639213 is a deficient number, since it is larger than the sum of its proper divisors (1317235).

56639213 is a wasteful number, since it uses less digits than its factorization.

56639213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1317234.

The product of its digits is 29160, while the sum is 35.

The square root of 56639213 is about 7525.9028029865. The cubic root of 56639213 is about 384.0364119299.

The spelling of 56639213 in words is "fifty-six million, six hundred thirty-nine thousand, two hundred thirteen".