251328251 has 2 divisors, whose sum is σ = 251328252. Its totient is φ = 251328250.

The previous prime is 251328247. The next prime is 251328277. The reversal of 251328251 is 152823152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 251328251 - 2² = 251328247 is a prime.

It is not a weakly prime, because it can be changed into another prime (251328211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125664125 + 125664126.

It is an arithmetic number, because the mean of its divisors is an integer number (125664126).

Almost surely, 2^251328251 is an apocalyptic number.

251328251 is a deficient number, since it is larger than the sum of its proper divisors (1).

251328251 is an equidigital number, since it uses as much as digits as its factorization.

251328251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 29.

The square root of 251328251 is about 15853.3356426968. The cubic root of 251328251 is about 631.0742158515.

The spelling of 251328251 in words is "two hundred fifty-one million, three hundred twenty-eight thousand, two hundred fifty-one".