137618991 has 12 divisors (see below), whose sum is σ = 198985800. Its totient is φ = 91652400.

The previous prime is 137618983. The next prime is 137618993. The reversal of 137618991 is 199816731.

It is not a de Polignac number, because 137618991 - 2³ = 137618983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137618993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2185 + ... + 16733.

It is an arithmetic number, because the mean of its divisors is an integer number (16582150).

Almost surely, 2^137618991 is an apocalyptic number.

137618991 is a deficient number, since it is larger than the sum of its proper divisors (61366809).

137618991 is a wasteful number, since it uses less digits than its factorization.

137618991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15606 (or 15603 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 137618991 is about 11731.1120956199. The cubic root of 137618991 is about 516.2889021254.

The spelling of 137618991 in words is "one hundred thirty-seven million, six hundred eighteen thousand, nine hundred ninety-one".