251213563 has 8 divisors (see below), whose sum is σ = 258006960. Its totient is φ = 244504800.

The previous prime is 251213551. The next prime is 251213569. The reversal of 251213563 is 365312152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251213563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251213569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15120 + ... + 27037.

It is an arithmetic number, because the mean of its divisors is an integer number (32250870).

Almost surely, 2^251213563 is an apocalyptic number.

251213563 is a deficient number, since it is larger than the sum of its proper divisors (6793397).

251213563 is a wasteful number, since it uses less digits than its factorization.

251213563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42317.

The product of its digits is 5400, while the sum is 28.

The square root of 251213563 is about 15849.7180732024. The cubic root of 251213563 is about 630.9782090671.

The spelling of 251213563 in words is "two hundred fifty-one million, two hundred thirteen thousand, five hundred sixty-three".