251315149 has 2 divisors, whose sum is σ = 251315150. Its totient is φ = 251315148.

The previous prime is 251315111. The next prime is 251315153. The reversal of 251315149 is 941513152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156875625 + 94439524 = 12525^2 + 9718^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251315149 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 251315149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251315849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125657574 + 125657575.

It is an arithmetic number, because the mean of its divisors is an integer number (125657575).

Almost surely, 2^251315149 is an apocalyptic number.

It is an amenable number.

251315149 is a deficient number, since it is larger than the sum of its proper divisors (1).

251315149 is an equidigital number, since it uses as much as digits as its factorization.

251315149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 31.

The square root of 251315149 is about 15852.9224119719. The cubic root of 251315149 is about 631.0632494785.

The spelling of 251315149 in words is "two hundred fifty-one million, three hundred fifteen thousand, one hundred forty-nine".