136691287 has 2 divisors, whose sum is σ = 136691288. Its totient is φ = 136691286.

The previous prime is 136691257. The next prime is 136691299. The reversal of 136691287 is 782196631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 136691287 - 2¹¹ = 136689239 is a prime.

It is equal to p_7735759 and since 136691287 and 7735759 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136691207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68345643 + 68345644.

It is an arithmetic number, because the mean of its divisors is an integer number (68345644).

Almost surely, 2^136691287 is an apocalyptic number.

136691287 is a deficient number, since it is larger than the sum of its proper divisors (1).

136691287 is an equidigital number, since it uses as much as digits as its factorization.

136691287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 136691287 is about 11691.5049074103. The cubic root of 136691287 is about 515.1261663427.

The spelling of 136691287 in words is "one hundred thirty-six million, six hundred ninety-one thousand, two hundred eighty-seven".