158136813 has 8 divisors (see below), whose sum is σ = 234276800. Its totient is φ = 105424524.

The previous prime is 158136793. The next prime is 158136841. The reversal of 158136813 is 318631851.

158136813 is a `hidden beast` number, since 1 + 581 + 3 + 68 + 13 = 666.

It is not a de Polignac number, because 158136813 - 2¹⁷ = 158005741 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 (158136863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2928433 + ... + 2928486.

It is an arithmetic number, because the mean of its divisors is an integer number (29284600).

Almost surely, 2^158136813 is an apocalyptic number.

It is an amenable number.

158136813 is a deficient number, since it is larger than the sum of its proper divisors (76139987).

158136813 is an equidigital number, since it uses as much as digits as its factorization.

158136813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5856928 (or 5856922 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 158136813 is about 12575.2460413306. The cubic root of 158136813 is about 540.7680121193.

The spelling of 158136813 in words is "one hundred fifty-eight million, one hundred thirty-six thousand, eight hundred thirteen".