137999189 has 4 divisors (see below), whose sum is σ = 138023340. Its totient is φ = 137975040.

The previous prime is 137999179. The next prime is 137999201. The reversal of 137999189 is 981999731.

137999189 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: 981999731 = 1783 ⋅550757.

It can be written as a sum of positive squares in 2 ways, for example, as 80694289 + 57304900 = 8983^2 + 7570^2 .

It is a cyclic number.

It is not a de Polignac number, because 137999189 - 2⁸ = 137998933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137999119) 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, 1847 + ... + 16715.

It is an arithmetic number, because the mean of its divisors is an integer number (34505835).

Almost surely, 2^137999189 is an apocalyptic number.

It is an amenable number.

137999189 is a deficient number, since it is larger than the sum of its proper divisors (24151).

137999189 is an equidigital number, since it uses as much as digits as its factorization.

137999189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24150.

The product of its digits is 1102248, while the sum is 56.

The square root of 137999189 is about 11747.3056059677. The cubic root of 137999189 is about 516.7639129243.

The spelling of 137999189 in words is "one hundred thirty-seven million, nine hundred ninety-nine thousand, one hundred eighty-nine".