137621791 has 4 divisors (see below), whose sum is σ = 142367400. Its totient is φ = 132876184.

The previous prime is 137621723. The next prime is 137621797. The reversal of 137621791 is 197126731.

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

It is a cyclic number.

It is not a de Polignac number, because 137621791 - 2⁷ = 137621663 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 137621791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137621797) 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, 2372761 + ... + 2372818.

It is an arithmetic number, because the mean of its divisors is an integer number (35591850).

Almost surely, 2^137621791 is an apocalyptic number.

137621791 is a deficient number, since it is larger than the sum of its proper divisors (4745609).

137621791 is an equidigital number, since it uses as much as digits as its factorization.

137621791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4745608.

The product of its digits is 15876, while the sum is 37.

The square root of 137621791 is about 11731.2314357871. The cubic root of 137621791 is about 516.2924035780.

The spelling of 137621791 in words is "one hundred thirty-seven million, six hundred twenty-one thousand, seven hundred ninety-one".