137505091 has 4 divisors (see below), whose sum is σ = 137530800. Its totient is φ = 137479384.

The previous prime is 137505083. The next prime is 137505101. The reversal of 137505091 is 190505731.

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

It is a cyclic number.

It is not a de Polignac number, because 137505091 - 2³ = 137505083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137505001) 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, 1471 + ... + 16648.

It is an arithmetic number, because the mean of its divisors is an integer number (34382700).

Almost surely, 2^137505091 is an apocalyptic number.

137505091 is a deficient number, since it is larger than the sum of its proper divisors (25709).

137505091 is an equidigital number, since it uses as much as digits as its factorization.

137505091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25708.

The product of its (nonzero) digits is 4725, while the sum is 31.

The square root of 137505091 is about 11726.2564785186. The cubic root of 137505091 is about 516.1464277563.

The spelling of 137505091 in words is "one hundred thirty-seven million, five hundred five thousand, ninety-one".