136215491 has 2 divisors, whose sum is σ = 136215492. Its totient is φ = 136215490.

The previous prime is 136215487. The next prime is 136215493. The reversal of 136215491 is 194512631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 136215491 - 2² = 136215487 is a prime.

Together with 136215493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (136215493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68107745 + 68107746.

It is an arithmetic number, because the mean of its divisors is an integer number (68107746).

Almost surely, 2^136215491 is an apocalyptic number.

136215491 is a deficient number, since it is larger than the sum of its proper divisors (1).

136215491 is an equidigital number, since it uses as much as digits as its factorization.

136215491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 32.

The square root of 136215491 is about 11671.1392331683. The cubic root of 136215491 is about 514.5277865871.

The spelling of 136215491 in words is "one hundred thirty-six million, two hundred fifteen thousand, four hundred ninety-one".