251004881 has 6 divisors (see below), whose sum is σ = 266638710. Its totient is φ = 236239616.

The previous prime is 251004857. The next prime is 251004893. The reversal of 251004881 is 188400152.

It can be written as a sum of positive squares in 3 ways, for example, as 74114881 + 176890000 = 8609^2 + 13300^2 .

It is not a de Polignac number, because 251004881 - 2¹⁴ = 250988497 is a prime.

It is a super-2 number, since 2×251004881² = 126006900571648322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (251004181) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 433976 + ... + 434553.

It is an arithmetic number, because the mean of its divisors is an integer number (44439785).

Almost surely, 2^251004881 is an apocalyptic number.

It is an amenable number.

251004881 is a deficient number, since it is larger than the sum of its proper divisors (15633829).

251004881 is an equidigital number, since it uses as much as digits as its factorization.

251004881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868563 (or 868546 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 251004881 is about 15843.1335600001. The cubic root of 251004881 is about 630.8034437265.

The spelling of 251004881 in words is "two hundred fifty-one million, four thousand, eight hundred eighty-one".