8251187157 has 6 divisors (see below), whose sum is σ = 11918381462. Its totient is φ = 5500791432.

The previous prime is 8251187129. The next prime is 8251187159. The reversal of 8251187157 is 7517811528.

8251187157 is a `hidden beast` number, since 8 + 2 + 511 + 87 + 1 + 57 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8015441841 + 235745316 = 89529^2 + 15354^2 .

It is not a de Polignac number, because 8251187157 - 2⁶ = 8251187093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8251187159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 458399278 + ... + 458399295.

Almost surely, 2^8251187157 is an apocalyptic number.

It is an amenable number.

8251187157 is a deficient number, since it is larger than the sum of its proper divisors (3667194305).

8251187157 is a wasteful number, since it uses less digits than its factorization.

8251187157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916798579 (or 916798576 counting only the distinct ones).

The product of its digits is 156800, while the sum is 45.

The square root of 8251187157 is about 90836.0454720482. The cubic root of 8251187157 is about 2020.7169265995.

The spelling of 8251187157 in words is "eight billion, two hundred fifty-one million, one hundred eighty-seven thousand, one hundred fifty-seven".