137223791 has 4 divisors (see below), whose sum is σ = 137275584. Its totient is φ = 137172000.

The previous prime is 137223769. The next prime is 137223803. The reversal of 137223791 is 197322731.

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 137223791 - 2¹⁸ = 136961647 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 (137223991) 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 3 ways as a sum of consecutive naturals, for example, 21695 + ... + 27296.

It is an arithmetic number, because the mean of its divisors is an integer number (34318896).

Almost surely, 2^137223791 is an apocalyptic number.

137223791 is a deficient number, since it is larger than the sum of its proper divisors (51793).

137223791 is an equidigital number, since it uses as much as digits as its factorization.

137223791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51792.

The product of its digits is 15876, while the sum is 35.

The square root of 137223791 is about 11714.2558875927. The cubic root of 137223791 is about 515.7942199211.

The spelling of 137223791 in words is "one hundred thirty-seven million, two hundred twenty-three thousand, seven hundred ninety-one".