1631559157 has 2 divisors, whose sum is σ = 1631559158. Its totient is φ = 1631559156.

The previous prime is 1631559133. The next prime is 1631559179. The reversal of 1631559157 is 7519551361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1529670321 + 101888836 = 39111^2 + 10094^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631559157 - 2⁷ = 1631559029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1631559107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815779578 + 815779579.

It is an arithmetic number, because the mean of its divisors is an integer number (815779579).

Almost surely, 2^1631559157 is an apocalyptic number.

It is an amenable number.

1631559157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631559157 is an equidigital number, since it uses as much as digits as its factorization.

1631559157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141750, while the sum is 43.

The square root of 1631559157 is about 40392.5631397662. The cubic root of 1631559157 is about 1177.2470432383.

The spelling of 1631559157 in words is "one billion, six hundred thirty-one million, five hundred fifty-nine thousand, one hundred fifty-seven".