136867691 has 4 divisors (see below), whose sum is σ = 136954992. Its totient is φ = 136780392.

The previous prime is 136867657. The next prime is 136867693. The reversal of 136867691 is 196768631.

It is a happy number.

136867691 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.

It is a cyclic number.

It is not a de Polignac number, because 136867691 - 2¹⁴ = 136851307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136867693) 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, 41255 + ... + 44448.

It is an arithmetic number, because the mean of its divisors is an integer number (34238748).

Almost surely, 2^136867691 is an apocalyptic number.

136867691 is a deficient number, since it is larger than the sum of its proper divisors (87301).

136867691 is an equidigital number, since it uses as much as digits as its factorization.

136867691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87300.

The product of its digits is 326592, while the sum is 47.

The square root of 136867691 is about 11699.0465850855. The cubic root of 136867691 is about 515.3476660838.

The spelling of 136867691 in words is "one hundred thirty-six million, eight hundred sixty-seven thousand, six hundred ninety-one".