137991625 has 8 divisors (see below), whose sum is σ = 172213704. Its totient is φ = 110393200.

The previous prime is 137991617. The next prime is 137991631. The reversal of 137991625 is 526199731.

It can be written as a sum of positive squares in 4 ways, for example, as 13512976 + 124478649 = 3676^2 + 11157^2 .

It is not a de Polignac number, because 137991625 - 2³ = 137991617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 551842 + ... + 552091.

It is an arithmetic number, because the mean of its divisors is an integer number (21526713).

Almost surely, 2^137991625 is an apocalyptic number.

It is an amenable number.

137991625 is a deficient number, since it is larger than the sum of its proper divisors (34222079).

137991625 is an equidigital number, since it uses as much as digits as its factorization.

137991625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103948 (or 1103938 counting only the distinct ones).

The product of its digits is 102060, while the sum is 43.

The square root of 137991625 is about 11746.9836553900. The cubic root of 137991625 is about 516.7544711451.

The spelling of 137991625 in words is "one hundred thirty-seven million, nine hundred ninety-one thousand, six hundred twenty-five".