137327921 has 4 divisors (see below), whose sum is σ = 145406052. Its totient is φ = 129249792.

The previous prime is 137327909. The next prime is 137327933. The reversal of 137327921 is 129723731.

137327921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (137327909) and next prime (137327933).

It can be written as a sum of positive squares in 2 ways, for example, as 48497296 + 88830625 = 6964^2 + 9425^2 .

It is a cyclic number.

It is not a de Polignac number, because 137327921 - 2⁶ = 137327857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137327951) 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, 4039040 + ... + 4039073.

It is an arithmetic number, because the mean of its divisors is an integer number (36351513).

Almost surely, 2^137327921 is an apocalyptic number.

It is an amenable number.

137327921 is a deficient number, since it is larger than the sum of its proper divisors (8078131).

137327921 is an equidigital number, since it uses as much as digits as its factorization.

137327921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8078130.

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

The square root of 137327921 is about 11718.6996292251. The cubic root of 137327921 is about 515.9246542331.

The spelling of 137327921 in words is "one hundred thirty-seven million, three hundred twenty-seven thousand, nine hundred twenty-one".