136687791 has 4 divisors (see below), whose sum is σ = 182250392. Its totient is φ = 91125192.

The previous prime is 136687783. The next prime is 136687799. The reversal of 136687791 is 197786631.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (136687783) and next prime (136687799).

It is not a de Polignac number, because 136687791 - 2³ = 136687783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 136687791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136687799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22781296 + ... + 22781301.

It is an arithmetic number, because the mean of its divisors is an integer number (45562598).

Almost surely, 2^136687791 is an apocalyptic number.

136687791 is a deficient number, since it is larger than the sum of its proper divisors (45562601).

136687791 is an equidigital number, since it uses as much as digits as its factorization.

136687791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45562600.

The product of its digits is 381024, while the sum is 48.

The square root of 136687791 is about 11691.3553961891. The cubic root of 136687791 is about 515.1217747036.

The spelling of 136687791 in words is "one hundred thirty-six million, six hundred eighty-seven thousand, seven hundred ninety-one".