136437391 has 2 divisors, whose sum is σ = 136437392. Its totient is φ = 136437390.

The previous prime is 136437377. The next prime is 136437397. The reversal of 136437391 is 193734631.

136437391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 136437391 - 2⁹ = 136436879 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 136437391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136437397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68218695 + 68218696.

It is an arithmetic number, because the mean of its divisors is an integer number (68218696).

Almost surely, 2^136437391 is an apocalyptic number.

136437391 is a deficient number, since it is larger than the sum of its proper divisors (1).

136437391 is an equidigital number, since it uses as much as digits as its factorization.

136437391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 37.

The square root of 136437391 is about 11680.6417203851. The cubic root of 136437391 is about 514.8070298492.

The spelling of 136437391 in words is "one hundred thirty-six million, four hundred thirty-seven thousand, three hundred ninety-one".