137991679 has 8 divisors (see below), whose sum is σ = 158453888. Its totient is φ = 117716760.

The previous prime is 137991677. The next prime is 137991683. The reversal of 137991679 is 976199731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 137991679 - 2¹ = 137991677 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 (137991673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45237 + ... + 48190.

It is an arithmetic number, because the mean of its divisors is an integer number (19806736).

Almost surely, 2^137991679 is an apocalyptic number.

137991679 is a deficient number, since it is larger than the sum of its proper divisors (20462209).

137991679 is an equidigital number, since it uses as much as digits as its factorization.

137991679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93645.

The product of its digits is 642978, while the sum is 52.

The square root of 137991679 is about 11746.9859538522. The cubic root of 137991679 is about 516.7545385519.

The spelling of 137991679 in words is "one hundred thirty-seven million, nine hundred ninety-one thousand, six hundred seventy-nine".