251564963 has 12 divisors (see below), whose sum is σ = 287794080. Its totient is φ = 218550912.

The previous prime is 251564953. The next prime is 251564983. The reversal of 251564963 is 369465152.

It is not a de Polignac number, because 251564963 - 2¹⁴ = 251548579 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 251564963.

It is not an unprimeable number, because it can be changed into a prime (251564903) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29723 + ... + 37236.

It is an arithmetic number, because the mean of its divisors is an integer number (23982840).

Almost surely, 2^251564963 is an apocalyptic number.

251564963 is a deficient number, since it is larger than the sum of its proper divisors (36229117).

251564963 is a wasteful number, since it uses less digits than its factorization.

251564963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67006 (or 66989 counting only the distinct ones).

The product of its digits is 194400, while the sum is 41.

The square root of 251564963 is about 15860.7995700091. The cubic root of 251564963 is about 631.2722781668.

The spelling of 251564963 in words is "two hundred fifty-one million, five hundred sixty-four thousand, nine hundred sixty-three".