137661913 has 4 divisors (see below), whose sum is σ = 138382848. Its totient is φ = 136940980.

The previous prime is 137661899. The next prime is 137661929. The reversal of 137661913 is 319166731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 137661913 - 2⁹ = 137661401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137661983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360181 + ... + 360562.

It is an arithmetic number, because the mean of its divisors is an integer number (34595712).

Almost surely, 2^137661913 is an apocalyptic number.

It is an amenable number.

137661913 is a deficient number, since it is larger than the sum of its proper divisors (720935).

137661913 is an equidigital number, since it uses as much as digits as its factorization.

137661913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720934.

The product of its digits is 20412, while the sum is 37.

The square root of 137661913 is about 11732.9413618240. The cubic root of 137661913 is about 516.3425716775.

The spelling of 137661913 in words is "one hundred thirty-seven million, six hundred sixty-one thousand, nine hundred thirteen".