251972463 has 4 divisors (see below), whose sum is σ = 335963288. Its totient is φ = 167981640.

The previous prime is 251972437. The next prime is 251972467. The reversal of 251972463 is 364279152.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 251972463 - 2¹⁰ = 251971439 is a prime.

It is a super-2 number, since 2×251972463² = 126980244220572738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251972467) 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, 41995408 + ... + 41995413.

It is an arithmetic number, because the mean of its divisors is an integer number (83990822).

Almost surely, 2^251972463 is an apocalyptic number.

251972463 is a deficient number, since it is larger than the sum of its proper divisors (83990825).

251972463 is an equidigital number, since it uses as much as digits as its factorization.

251972463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83990824.

The product of its digits is 90720, while the sum is 39.

The square root of 251972463 is about 15873.6405087176. The cubic root of 251972463 is about 631.6129518384.

The spelling of 251972463 in words is "two hundred fifty-one million, nine hundred seventy-two thousand, four hundred sixty-three".