136677391 has 4 divisors (see below), whose sum is σ = 136700784. Its totient is φ = 136654000.

The previous prime is 136677383. The next prime is 136677421. The reversal of 136677391 is 193776631.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 193776631 = 7039 ⋅27529.

It is a cyclic number.

It is not a de Polignac number, because 136677391 - 2³ = 136677383 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 (136677691) 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, 5331 + ... + 17371.

It is an arithmetic number, because the mean of its divisors is an integer number (34175196).

Almost surely, 2^136677391 is an apocalyptic number.

136677391 is a deficient number, since it is larger than the sum of its proper divisors (23393).

136677391 is a wasteful number, since it uses less digits than its factorization.

136677391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23392.

The product of its digits is 142884, while the sum is 43.

The square root of 136677391 is about 11690.9106146613. The cubic root of 136677391 is about 515.1087098880.

The spelling of 136677391 in words is "one hundred thirty-six million, six hundred seventy-seven thousand, three hundred ninety-one".