136691816 has 8 divisors (see below), whose sum is σ = 256297170. Its totient is φ = 68345904.

The previous prime is 136691791. The next prime is 136691831. The reversal of 136691816 is 618196631.

It can be written as a sum of positive squares in only one way, i.e., 73170916 + 63520900 = 8554^2 + 7970^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×136691816² = 37369305122755712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8543231 + ... + 8543246.

Almost surely, 2^136691816 is an apocalyptic number.

It is an amenable number.

136691816 is a deficient number, since it is larger than the sum of its proper divisors (119605354).

136691816 is a wasteful number, since it uses less digits than its factorization.

136691816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17086483 (or 17086479 counting only the distinct ones).

The product of its digits is 46656, while the sum is 41.

The square root of 136691816 is about 11691.5275306523. The cubic root of 136691816 is about 515.1268308606.

The spelling of 136691816 in words is "one hundred thirty-six million, six hundred ninety-one thousand, eight hundred sixteen".