136811897 has 4 divisors (see below), whose sum is σ = 141225216. Its totient is φ = 132398580.

The previous prime is 136811891. The next prime is 136811929. The reversal of 136811897 is 798118631.

136811897 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 136811897 - 2⁴ = 136811881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136811891) 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, 2206613 + ... + 2206674.

It is an arithmetic number, because the mean of its divisors is an integer number (35306304).

Almost surely, 2^136811897 is an apocalyptic number.

It is an amenable number.

136811897 is a deficient number, since it is larger than the sum of its proper divisors (4413319).

136811897 is an equidigital number, since it uses as much as digits as its factorization.

136811897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4413318.

The product of its digits is 72576, while the sum is 44.

The square root of 136811897 is about 11696.6617887327. The cubic root of 136811897 is about 515.2776295508.

The spelling of 136811897 in words is "one hundred thirty-six million, eight hundred eleven thousand, eight hundred ninety-seven".