251315153 has 2 divisors, whose sum is σ = 251315154. Its totient is φ = 251315152.

The previous prime is 251315149. The next prime is 251315209. The reversal of 251315153 is 351513152.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174979984 + 76335169 = 13228^2 + 8737^2 .

It is a cyclic number.

It is not a de Polignac number, because 251315153 - 2² = 251315149 is a prime.

It is a super-2 number, since 2×251315153² = 126318612254826818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (251312153) 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 as a sum of consecutive naturals, namely, 125657576 + 125657577.

It is an arithmetic number, because the mean of its divisors is an integer number (125657577).

Almost surely, 2^251315153 is an apocalyptic number.

It is an amenable number.

251315153 is a deficient number, since it is larger than the sum of its proper divisors (1).

251315153 is an equidigital number, since it uses as much as digits as its factorization.

251315153 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2250, while the sum is 26.

The square root of 251315153 is about 15852.9225381316. The cubic root of 251315153 is about 631.0632528265.

The spelling of 251315153 in words is "two hundred fifty-one million, three hundred fifteen thousand, one hundred fifty-three".