251487963 has 16 divisors (see below), whose sum is σ = 372819840. Its totient is φ = 167548392.

The previous prime is 251487959. The next prime is 251487967. The reversal of 251487963 is 369784152.

251487963 is a `hidden beast` number, since 2 + 514 + 8 + 79 + 63 = 666.

It is an interprime number because it is at equal distance from previous prime (251487959) and next prime (251487967).

It is not a de Polignac number, because 251487963 - 2² = 251487959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (251487967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74020 + ... + 77342.

It is an arithmetic number, because the mean of its divisors is an integer number (23301240).

Almost surely, 2^251487963 is an apocalyptic number.

251487963 is a deficient number, since it is larger than the sum of its proper divisors (121331877).

251487963 is a wasteful number, since it uses less digits than its factorization.

251487963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6135 (or 6129 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 251487963 is about 15858.3720160677. The cubic root of 251487963 is about 631.2078641548.

The spelling of 251487963 in words is "two hundred fifty-one million, four hundred eighty-seven thousand, nine hundred sixty-three".