213561255 has 32 divisors (see below), whose sum is σ = 348641280. Its totient is φ = 111605760.

The previous prime is 213561223. The next prime is 213561269. The reversal of 213561255 is 552165312.

It is a happy number.

It is not a de Polignac number, because 213561255 - 2⁵ = 213561223 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 205026 + ... + 206064.

It is an arithmetic number, because the mean of its divisors is an integer number (10895040).

Almost surely, 2^213561255 is an apocalyptic number.

213561255 is a deficient number, since it is larger than the sum of its proper divisors (135080025).

213561255 is a wasteful number, since it uses less digits than its factorization.

213561255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311.

The product of its digits is 9000, while the sum is 30.

The square root of 213561255 is about 14613.7351488249. The cubic root of 213561255 is about 597.7333507290.

The spelling of 213561255 in words is "two hundred thirteen million, five hundred sixty-one thousand, two hundred fifty-five".