137275321 has 4 divisors (see below), whose sum is σ = 137782144. Its totient is φ = 136768500.

The previous prime is 137275319. The next prime is 137275351. The reversal of 137275321 is 123572731.

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, and also an emirpimes, since its reverse is a distinct semiprime: 123572731 = 71 ⋅1740461.

It is a cyclic number.

It is not a de Polignac number, because 137275321 - 2¹ = 137275319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137275351) 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, 253005 + ... + 253546.

It is an arithmetic number, because the mean of its divisors is an integer number (34445536).

Almost surely, 2^137275321 is an apocalyptic number.

It is an amenable number.

137275321 is a deficient number, since it is larger than the sum of its proper divisors (506823).

137275321 is an equidigital number, since it uses as much as digits as its factorization.

137275321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506822.

The product of its digits is 8820, while the sum is 31.

The square root of 137275321 is about 11716.4551379673. The cubic root of 137275321 is about 515.8587751748.

The spelling of 137275321 in words is "one hundred thirty-seven million, two hundred seventy-five thousand, three hundred twenty-one".