251982801 has 12 divisors (see below), whose sum is σ = 415971712. Its totient is φ = 143990136.

The previous prime is 251982799. The next prime is 251982803. The reversal of 251982801 is 108289152.

It is an interprime number because it is at equal distance from previous prime (251982799) and next prime (251982803).

It is not a de Polignac number, because 251982801 - 2¹ = 251982799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251982803) 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, 1999801 + ... + 1999926.

Almost surely, 2^251982801 is an apocalyptic number.

251982801 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

251982801 is a deficient number, since it is larger than the sum of its proper divisors (163988911).

251982801 is a wasteful number, since it uses less digits than its factorization.

251982801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3999740 (or 3999737 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 251982801 is about 15873.9661395632. The cubic root of 251982801 is about 631.6215897206.

The spelling of 251982801 in words is "two hundred fifty-one million, nine hundred eighty-two thousand, eight hundred one".