251598401 has 4 divisors (see below), whose sum is σ = 252706992. Its totient is φ = 250489812.

The previous prime is 251598397. The next prime is 251598439. The reversal of 251598401 is 104895152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 251598401 - 2² = 251598397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (251598491) 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, 553955 + ... + 554408.

It is an arithmetic number, because the mean of its divisors is an integer number (63176748).

Almost surely, 2^251598401 is an apocalyptic number.

It is an amenable number.

251598401 is a deficient number, since it is larger than the sum of its proper divisors (1108591).

251598401 is a wasteful number, since it uses less digits than its factorization.

251598401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108590.

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 251598401 is about 15861.8536432537. The cubic root of 251598401 is about 631.3002464856.

The spelling of 251598401 in words is "two hundred fifty-one million, five hundred ninety-eight thousand, four hundred one".