256453213 has 4 divisors (see below), whose sum is σ = 258850080. Its totient is φ = 254056348.

The previous prime is 256453201. The next prime is 256453229. The reversal of 256453213 is 312354652.

It is a happy number.

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 256453213 - 2²¹ = 254356061 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 (256453283) 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, 1198273 + ... + 1198486.

It is an arithmetic number, because the mean of its divisors is an integer number (64712520).

Almost surely, 2^256453213 is an apocalyptic number.

It is an amenable number.

256453213 is a deficient number, since it is larger than the sum of its proper divisors (2396867).

256453213 is a wasteful number, since it uses less digits than its factorization.

256453213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2396866.

The product of its digits is 21600, while the sum is 31.

The square root of 256453213 is about 16014.1566434202. The cubic root of 256453213 is about 635.3349034220.

The spelling of 256453213 in words is "two hundred fifty-six million, four hundred fifty-three thousand, two hundred thirteen".