137891885 has 4 divisors (see below), whose sum is σ = 165470268. Its totient is φ = 110313504.

The previous prime is 137891857. The next prime is 137891891. The reversal of 137891885 is 588198731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47375689 + 90516196 = 6883^2 + 9514^2 .

It is a cyclic number.

It is not a de Polignac number, because 137891885 - 2⁸ = 137891629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13789184 + ... + 13789193.

It is an arithmetic number, because the mean of its divisors is an integer number (41367567).

Almost surely, 2^137891885 is an apocalyptic number.

It is an amenable number.

137891885 is a deficient number, since it is larger than the sum of its proper divisors (27578383).

137891885 is an equidigital number, since it uses as much as digits as its factorization.

137891885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27578382.

The product of its digits is 483840, while the sum is 50.

The square root of 137891885 is about 11742.7375428390. The cubic root of 137891885 is about 516.6299381915.

The spelling of 137891885 in words is "one hundred thirty-seven million, eight hundred ninety-one thousand, eight hundred eighty-five".