251322251 has 4 divisors (see below), whose sum is σ = 257452104. Its totient is φ = 245192400.

The previous prime is 251322223. The next prime is 251322259. The reversal of 251322251 is 152223152.

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

It is a cyclic number.

It is not a de Polignac number, because 251322251 - 2⁶ = 251322187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251322259) 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, 3064865 + ... + 3064946.

It is an arithmetic number, because the mean of its divisors is an integer number (64363026).

Almost surely, 2^251322251 is an apocalyptic number.

251322251 is a deficient number, since it is larger than the sum of its proper divisors (6129853).

251322251 is an equidigital number, since it uses as much as digits as its factorization.

251322251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6129852.

The product of its digits is 1200, while the sum is 23.

The square root of 251322251 is about 15853.1464069440. The cubic root of 251322251 is about 631.0691938993.

Subtracting from 251322251 its reverse (152223152), we obtain a palindrome (99099099).

The spelling of 251322251 in words is "two hundred fifty-one million, three hundred twenty-two thousand, two hundred fifty-one".