251028157 has 2 divisors, whose sum is σ = 251028158. Its totient is φ = 251028156.

The previous prime is 251028077. The next prime is 251028181. The reversal of 251028157 is 751820152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187443481 + 63584676 = 13691^2 + 7974^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251028157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251020157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125514078 + 125514079.

It is an arithmetic number, because the mean of its divisors is an integer number (125514079).

Almost surely, 2^251028157 is an apocalyptic number.

It is an amenable number.

251028157 is a deficient number, since it is larger than the sum of its proper divisors (1).

251028157 is an equidigital number, since it uses as much as digits as its factorization.

251028157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 251028157 is about 15843.8681198753. The cubic root of 251028157 is about 630.8229415241.

The spelling of 251028157 in words is "two hundred fifty-one million, twenty-eight thousand, one hundred fifty-seven".