136831821 has 16 divisors (see below), whose sum is σ = 209891328. Its totient is φ = 77670000.

The previous prime is 136831811. The next prime is 136831829. The reversal of 136831821 is 128138631.

136831821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 136831821 - 2⁶ = 136831757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136831829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18405 + ... + 24746.

It is an arithmetic number, because the mean of its divisors is an integer number (13118208).

Almost surely, 2^136831821 is an apocalyptic number.

It is an amenable number.

136831821 is a deficient number, since it is larger than the sum of its proper divisors (73059507).

136831821 is a wasteful number, since it uses less digits than its factorization.

136831821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43312.

The product of its digits is 6912, while the sum is 33.

The square root of 136831821 is about 11697.5134537217. The cubic root of 136831821 is about 515.3026417351.

The spelling of 136831821 in words is "one hundred thirty-six million, eight hundred thirty-one thousand, eight hundred twenty-one".