137397517 has 2 divisors, whose sum is σ = 137397518. Its totient is φ = 137397516.

The previous prime is 137397499. The next prime is 137397521. The reversal of 137397517 is 715793731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98783721 + 38613796 = 9939^2 + 6214^2 .

It is an emirp because it is prime and its reverse (715793731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 137397517 - 2¹⁵ = 137364749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137397527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68698758 + 68698759.

It is an arithmetic number, because the mean of its divisors is an integer number (68698759).

Almost surely, 2^137397517 is an apocalyptic number.

It is an amenable number.

137397517 is a deficient number, since it is larger than the sum of its proper divisors (1).

137397517 is an equidigital number, since it uses as much as digits as its factorization.

137397517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138915, while the sum is 43.

The square root of 137397517 is about 11721.6686951986. The cubic root of 137397517 is about 516.0117941438.

The spelling of 137397517 in words is "one hundred thirty-seven million, three hundred ninety-seven thousand, five hundred seventeen".