158217517 has 2 divisors, whose sum is σ = 158217518. Its totient is φ = 158217516.

The previous prime is 158217509. The next prime is 158217539. The reversal of 158217517 is 715712851.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138980521 + 19236996 = 11789^2 + 4386^2 .

It is a cyclic number.

It is not a de Polignac number, because 158217517 - 2³ = 158217509 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158217547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79108758 + 79108759.

It is an arithmetic number, because the mean of its divisors is an integer number (79108759).

Almost surely, 2^158217517 is an apocalyptic number.

It is an amenable number.

158217517 is a deficient number, since it is larger than the sum of its proper divisors (1).

158217517 is an equidigital number, since it uses as much as digits as its factorization.

158217517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19600, while the sum is 37.

The square root of 158217517 is about 12578.4544758090. The cubic root of 158217517 is about 540.8599888466.

The spelling of 158217517 in words is "one hundred fifty-eight million, two hundred seventeen thousand, five hundred seventeen".