158317517 has 2 divisors, whose sum is σ = 158317518. Its totient is φ = 158317516.

The previous prime is 158317507. The next prime is 158317541. The reversal of 158317517 is 715713851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108035236 + 50282281 = 10394^2 + 7091^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158317517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158317507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79158758 + 79158759.

It is an arithmetic number, because the mean of its divisors is an integer number (79158759).

Almost surely, 2^158317517 is an apocalyptic number.

It is an amenable number.

158317517 is a deficient number, since it is larger than the sum of its proper divisors (1).

158317517 is an equidigital number, since it uses as much as digits as its factorization.

158317517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29400, while the sum is 38.

The square root of 158317517 is about 12582.4288990640. The cubic root of 158317517 is about 540.9739134593.

The spelling of 158317517 in words is "one hundred fifty-eight million, three hundred seventeen thousand, five hundred seventeen".