157636813 has 4 divisors (see below), whose sum is σ = 157727008. Its totient is φ = 157546620.

The previous prime is 157636799. The next prime is 157636819. The reversal of 157636813 is 318636751.

It is a happy number.

157636813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 157636813 - 2⁹ = 157636301 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 (157636819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42423 + ... + 45988.

It is an arithmetic number, because the mean of its divisors is an integer number (39431752).

Almost surely, 2^157636813 is an apocalyptic number.

It is an amenable number.

157636813 is a deficient number, since it is larger than the sum of its proper divisors (90195).

157636813 is an equidigital number, since it uses as much as digits as its factorization.

157636813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90194.

The product of its digits is 90720, while the sum is 40.

The square root of 157636813 is about 12555.3499752098. The cubic root of 157636813 is about 540.1974735015.

The spelling of 157636813 in words is "one hundred fifty-seven million, six hundred thirty-six thousand, eight hundred thirteen".