137879991 has 24 divisors (see below), whose sum is σ = 205367760. Its totient is φ = 89099136.

The previous prime is 137879983. The next prime is 137880031. The reversal of 137879991 is 199978731.

It is not a de Polignac number, because 137879991 - 2³ = 137879983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137879191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36985 + ... + 40541.

It is an arithmetic number, because the mean of its divisors is an integer number (8556990).

Almost surely, 2^137879991 is an apocalyptic number.

137879991 is a deficient number, since it is larger than the sum of its proper divisors (67487769).

137879991 is a wasteful number, since it uses less digits than its factorization.

137879991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3695 (or 3692 counting only the distinct ones).

The product of its digits is 857304, while the sum is 54.

The square root of 137879991 is about 11742.2310912365. The cubic root of 137879991 is about 516.6150836235.

The spelling of 137879991 in words is "one hundred thirty-seven million, eight hundred seventy-nine thousand, nine hundred ninety-one".