137688591 has 4 divisors (see below), whose sum is σ = 183584792. Its totient is φ = 91792392.

The previous prime is 137688589. The next prime is 137688599. The reversal of 137688591 is 195886731.

137688591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 195886731 = 3 ⋅65295577.

It is not a de Polignac number, because 137688591 - 2¹ = 137688589 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 137688591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137688599) 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, 22948096 + ... + 22948101.

It is an arithmetic number, because the mean of its divisors is an integer number (45896198).

Almost surely, 2^137688591 is an apocalyptic number.

137688591 is a deficient number, since it is larger than the sum of its proper divisors (45896201).

137688591 is an equidigital number, since it uses as much as digits as its factorization.

137688591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45896200.

The product of its digits is 362880, while the sum is 48.

The square root of 137688591 is about 11734.0781913195. The cubic root of 137688591 is about 516.3759241546.

The spelling of 137688591 in words is "one hundred thirty-seven million, six hundred eighty-eight thousand, five hundred ninety-one".