137389913 has 4 divisors (see below), whose sum is σ = 137497140. Its totient is φ = 137282688.

The previous prime is 137389909. The next prime is 137389919. The reversal of 137389913 is 319983731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 319983731 = 19 ⋅16841249.

It can be written as a sum of positive squares in 2 ways, for example, as 134281744 + 3108169 = 11588^2 + 1763^2 .

It is a cyclic number.

It is not a de Polignac number, because 137389913 - 2² = 137389909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137389919) 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, 51668 + ... + 54261.

It is an arithmetic number, because the mean of its divisors is an integer number (34374285).

Almost surely, 2^137389913 is an apocalyptic number.

It is an amenable number.

137389913 is a deficient number, since it is larger than the sum of its proper divisors (107227).

137389913 is a wasteful number, since it uses less digits than its factorization.

137389913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107226.

The product of its digits is 122472, while the sum is 44.

The square root of 137389913 is about 11721.3443341624. The cubic root of 137389913 is about 516.0022747431.

The spelling of 137389913 in words is "one hundred thirty-seven million, three hundred eighty-nine thousand, nine hundred thirteen".