136891507 has 2 divisors, whose sum is σ = 136891508. Its totient is φ = 136891506.

The previous prime is 136891499. The next prime is 136891511. The reversal of 136891507 is 705198631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 136891507 - 2³ = 136891499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 136891507.

It is not a weakly prime, because it can be changed into another prime (136891537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68445753 + 68445754.

It is an arithmetic number, because the mean of its divisors is an integer number (68445754).

Almost surely, 2^136891507 is an apocalyptic number.

136891507 is a deficient number, since it is larger than the sum of its proper divisors (1).

136891507 is an equidigital number, since it uses as much as digits as its factorization.

136891507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 136891507 is about 11700.0644015322. The cubic root of 136891507 is about 515.3775557972.

The spelling of 136891507 in words is "one hundred thirty-six million, eight hundred ninety-one thousand, five hundred seven".