213613256 has 8 divisors (see below), whose sum is σ = 400524870. Its totient is φ = 106806624.

The previous prime is 213613241. The next prime is 213613289. The reversal of 213613256 is 652316312.

It can be written as a sum of positive squares in only one way, i.e., 197852356 + 15760900 = 14066^2 + 3970^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13350821 + ... + 13350836.

Almost surely, 2^213613256 is an apocalyptic number.

It is an amenable number.

213613256 is a deficient number, since it is larger than the sum of its proper divisors (186911614).

213613256 is a wasteful number, since it uses less digits than its factorization.

213613256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26701663 (or 26701659 counting only the distinct ones).

The product of its digits is 6480, while the sum is 29.

The square root of 213613256 is about 14615.5142229071. The cubic root of 213613256 is about 597.7818617280.

Adding to 213613256 its reverse (652316312), we get a palindrome (865929568).

The spelling of 213613256 in words is "two hundred thirteen million, six hundred thirteen thousand, two hundred fifty-six".