8157823531 has 16 divisors (see below), whose sum is σ = 9705346560. Its totient is φ = 6759061920.

The previous prime is 8157823523. The next prime is 8157823589. The reversal of 8157823531 is 1353287518.

It is not a de Polignac number, because 8157823531 - 2³ = 8157823523 is a prime.

It is a super-2 number, since 2×8157823531² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8157803531) 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 in 15 ways as a sum of consecutive naturals, for example, 349765 + ... + 372358.

It is an arithmetic number, because the mean of its divisors is an integer number (606584160).

Almost surely, 2^8157823531 is an apocalyptic number.

8157823531 is a deficient number, since it is larger than the sum of its proper divisors (1547523029).

8157823531 is a wasteful number, since it uses less digits than its factorization.

8157823531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722226.

The product of its digits is 201600, while the sum is 43.

The square root of 8157823531 is about 90320.6705632769. The cubic root of 8157823531 is about 2013.0664094848.

The spelling of 8157823531 in words is "eight billion, one hundred fifty-seven million, eight hundred twenty-three thousand, five hundred thirty-one".