137091 has 4 divisors (see below), whose sum is σ = 182792. Its totient is φ = 91392.

The previous prime is 137089. The next prime is 137117. The reversal of 137091 is 190731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190731 = 3 ⋅63577.

It is not a de Polignac number, because 137091 - 2¹ = 137089 is a prime.

It is a D-number.

It is a Duffinian number.

137091 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (137191) 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, 22846 + ... + 22851.

It is an arithmetic number, because the mean of its divisors is an integer number (45698).

2¹³⁷⁰⁹¹ is an apocalyptic number.

137091 is a deficient number, since it is larger than the sum of its proper divisors (45701).

137091 is an equidigital number, since it uses as much as digits as its factorization.

137091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45700.

The product of its (nonzero) digits is 189, while the sum is 21.

The square root of 137091 is about 370.2580181441. The cubic root of 137091 is about 51.5627788782.

The spelling of 137091 in words is "one hundred thirty-seven thousand, ninety-one".