137321717 has 4 divisors (see below), whose sum is σ = 147884940. Its totient is φ = 126758496.

The previous prime is 137321713. The next prime is 137321783. The reversal of 137321717 is 717123731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 717123731 = 193 ⋅3715667.

It can be written as a sum of positive squares in 2 ways, for example, as 9156676 + 128165041 = 3026^2 + 11321^2 .

It is a cyclic number.

It is not a de Polignac number, because 137321717 - 2² = 137321713 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 (137321713) 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, 5281592 + ... + 5281617.

It is an arithmetic number, because the mean of its divisors is an integer number (36971235).

Almost surely, 2^137321717 is an apocalyptic number.

It is an amenable number.

137321717 is a deficient number, since it is larger than the sum of its proper divisors (10563223).

137321717 is a wasteful number, since it uses less digits than its factorization.

137321717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10563222.

The product of its digits is 6174, while the sum is 32.

The square root of 137321717 is about 11718.4349210976. The cubic root of 137321717 is about 515.9168848862.

The spelling of 137321717 in words is "one hundred thirty-seven million, three hundred twenty-one thousand, seven hundred seventeen".