136931287 has 4 divisors (see below), whose sum is σ = 137976696. Its totient is φ = 135885880.

The previous prime is 136931281. The next prime is 136931299. The reversal of 136931287 is 782139631.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 136931287 - 2³ = 136931279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136931281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 522508 + ... + 522769.

It is an arithmetic number, because the mean of its divisors is an integer number (34494174).

Almost surely, 2^136931287 is an apocalyptic number.

136931287 is a deficient number, since it is larger than the sum of its proper divisors (1045409).

136931287 is a wasteful number, since it uses less digits than its factorization.

136931287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045408.

The product of its digits is 54432, while the sum is 40.

The square root of 136931287 is about 11701.7642686904. The cubic root of 136931287 is about 515.4274730249.

The spelling of 136931287 in words is "one hundred thirty-six million, nine hundred thirty-one thousand, two hundred eighty-seven".