251225801 has 4 divisors (see below), whose sum is σ = 251672592. Its totient is φ = 250779012.

The previous prime is 251225783. The next prime is 251225831. The reversal of 251225801 is 108522152.

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 251225801 - 2¹⁴ = 251209417 is a prime.

It is a super-2 number, since 2×251225801² = 126228806176183202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251225831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222551 + ... + 223676.

It is an arithmetic number, because the mean of its divisors is an integer number (62918148).

Almost surely, 2^251225801 is an apocalyptic number.

It is an amenable number.

251225801 is a deficient number, since it is larger than the sum of its proper divisors (446791).

251225801 is an equidigital number, since it uses as much as digits as its factorization.

251225801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446790.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 251225801 is about 15850.1041321500. The cubic root of 251225801 is about 630.9884550451.

Adding to 251225801 its reverse (108522152), we get a palindrome (359747953).

The spelling of 251225801 in words is "two hundred fifty-one million, two hundred twenty-five thousand, eight hundred one".