251264563 has 8 divisors (see below), whose sum is σ = 274222080. Its totient is φ = 228326280.

The previous prime is 251264543. The next prime is 251264593. The reversal of 251264563 is 365462152.

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

It is a cyclic number.

It is not a de Polignac number, because 251264563 - 2⁹ = 251264051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (251264543) 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, 44958 + ... + 50236.

It is an arithmetic number, because the mean of its divisors is an integer number (34277760).

Almost surely, 2^251264563 is an apocalyptic number.

251264563 is a deficient number, since it is larger than the sum of its proper divisors (22957517).

251264563 is a wasteful number, since it uses less digits than its factorization.

251264563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9617.

The product of its digits is 43200, while the sum is 34.

The square root of 251264563 is about 15851.3268529798. The cubic root of 251264563 is about 631.0209054233.

The spelling of 251264563 in words is "two hundred fifty-one million, two hundred sixty-four thousand, five hundred sixty-three".