136987257 has 8 divisors (see below), whose sum is σ = 199254240. Its totient is φ = 83022560.

The previous prime is 136987247. The next prime is 136987289. The reversal of 136987257 is 752789631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 136987257 - 2⁷ = 136987129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (136987217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2075532 + ... + 2075597.

It is an arithmetic number, because the mean of its divisors is an integer number (24906780).

Almost surely, 2^136987257 is an apocalyptic number.

It is an amenable number.

136987257 is a deficient number, since it is larger than the sum of its proper divisors (62266983).

136987257 is a wasteful number, since it uses less digits than its factorization.

136987257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4151143.

The product of its digits is 635040, while the sum is 48.

The square root of 136987257 is about 11704.1555440792. The cubic root of 136987257 is about 515.4976896195.

The spelling of 136987257 in words is "one hundred thirty-six million, nine hundred eighty-seven thousand, two hundred fifty-seven".