137931647 has 4 divisors (see below), whose sum is σ = 157636176. Its totient is φ = 118227120.

The previous prime is 137931623. The next prime is 137931649. The reversal of 137931647 is 746139731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746139731 = 23833 ⋅31307.

It is a cyclic number.

It is not a de Polignac number, because 137931647 - 2¹² = 137927551 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 (137931649) 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, 9852254 + ... + 9852267.

It is an arithmetic number, because the mean of its divisors is an integer number (39409044).

Almost surely, 2^137931647 is an apocalyptic number.

137931647 is a deficient number, since it is larger than the sum of its proper divisors (19704529).

137931647 is an equidigital number, since it uses as much as digits as its factorization.

137931647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19704528.

The product of its digits is 95256, while the sum is 41.

The square root of 137931647 is about 11744.4304672470. The cubic root of 137931647 is about 516.6795912595.

The spelling of 137931647 in words is "one hundred thirty-seven million, nine hundred thirty-one thousand, six hundred forty-seven".