137321647 has 4 divisors (see below), whose sum is σ = 137486160. Its totient is φ = 137157136.

The previous prime is 137321627. The next prime is 137321651. The reversal of 137321647 is 746123731.

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 137321647 - 2²³ = 128933039 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 (137321617) 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, 80998 + ... + 82675.

It is an arithmetic number, because the mean of its divisors is an integer number (34371540).

Almost surely, 2^137321647 is an apocalyptic number.

137321647 is a deficient number, since it is larger than the sum of its proper divisors (164513).

137321647 is an equidigital number, since it uses as much as digits as its factorization.

137321647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164512.

The product of its digits is 21168, while the sum is 34.

The square root of 137321647 is about 11718.4319343503. The cubic root of 137321647 is about 515.9167972230.

The spelling of 137321647 in words is "one hundred thirty-seven million, three hundred twenty-one thousand, six hundred forty-seven".