137591321 has 4 divisors (see below), whose sum is σ = 157247232. Its totient is φ = 117935412.

The previous prime is 137591317. The next prime is 137591327. The reversal of 137591321 is 123195731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 137591321 - 2² = 137591317 is a prime.

It is a super-2 number, since 2×137591321² = 37862743229050082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137591327) 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, 9827945 + ... + 9827958.

It is an arithmetic number, because the mean of its divisors is an integer number (39311808).

Almost surely, 2^137591321 is an apocalyptic number.

It is an amenable number.

137591321 is a deficient number, since it is larger than the sum of its proper divisors (19655911).

137591321 is an equidigital number, since it uses as much as digits as its factorization.

137591321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19655910.

The product of its digits is 5670, while the sum is 32.

The square root of 137591321 is about 11729.9326937540. The cubic root of 137591321 is about 516.2542977166.

The spelling of 137591321 in words is "one hundred thirty-seven million, five hundred ninety-one thousand, three hundred twenty-one".