137561691 has 16 divisors (see below), whose sum is σ = 193587200. Its totient is φ = 86647968.

The previous prime is 137561657. The next prime is 137561713. The reversal of 137561691 is 196165731.

It is a happy number.

It is not a de Polignac number, because 137561691 - 2¹⁴ = 137545307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (137561651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19590 + ... + 25668.

It is an arithmetic number, because the mean of its divisors is an integer number (12099200).

Almost surely, 2^137561691 is an apocalyptic number.

137561691 is a deficient number, since it is larger than the sum of its proper divisors (56025509).

137561691 is a wasteful number, since it uses less digits than its factorization.

137561691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6498.

The product of its digits is 34020, while the sum is 39.

The square root of 137561691 is about 11728.6696176506. The cubic root of 137561691 is about 516.2172369658.

The spelling of 137561691 in words is "one hundred thirty-seven million, five hundred sixty-one thousand, six hundred ninety-one".