137958991 has 4 divisors (see below), whose sum is σ = 143957232. Its totient is φ = 131960752.

The previous prime is 137958983. The next prime is 137959001. The reversal of 137958991 is 199859731.

It is a happy number.

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

It is not a de Polignac number, because 137958991 - 2³ = 137958983 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 (137958911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2999086 + ... + 2999131.

It is an arithmetic number, because the mean of its divisors is an integer number (35989308).

Almost surely, 2^137958991 is an apocalyptic number.

137958991 is a deficient number, since it is larger than the sum of its proper divisors (5998241).

137958991 is an equidigital number, since it uses as much as digits as its factorization.

137958991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5998240.

The product of its digits is 612360, while the sum is 52.

The square root of 137958991 is about 11745.5945358249. The cubic root of 137958991 is about 516.7137317283.

The spelling of 137958991 in words is "one hundred thirty-seven million, nine hundred fifty-eight thousand, nine hundred ninety-one".