136239287 has 2 divisors, whose sum is σ = 136239288. Its totient is φ = 136239286.

The previous prime is 136239283. The next prime is 136239289. The reversal of 136239287 is 782932631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 136239287 - 2² = 136239283 is a prime.

It is a super-2 number, since 2×136239287² = 37122286644536738, which contains 22 as substring.

Together with 136239289, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136239283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68119643 + 68119644.

It is an arithmetic number, because the mean of its divisors is an integer number (68119644).

Almost surely, 2^136239287 is an apocalyptic number.

136239287 is a deficient number, since it is larger than the sum of its proper divisors (1).

136239287 is an equidigital number, since it uses as much as digits as its factorization.

136239287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 41.

The square root of 136239287 is about 11672.1586264067. The cubic root of 136239287 is about 514.5577464451.

The spelling of 136239287 in words is "one hundred thirty-six million, two hundred thirty-nine thousand, two hundred eighty-seven".