158989517 has 2 divisors, whose sum is σ = 158989518. Its totient is φ = 158989516.

The previous prime is 158989487. The next prime is 158989529. The reversal of 158989517 is 715989851.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135233641 + 23755876 = 11629^2 + 4874^2 .

It is an emirp because it is prime and its reverse (715989851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 158989517 - 2⁸ = 158989261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158989577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79494758 + 79494759.

It is an arithmetic number, because the mean of its divisors is an integer number (79494759).

Almost surely, 2^158989517 is an apocalyptic number.

It is an amenable number.

158989517 is a deficient number, since it is larger than the sum of its proper divisors (1).

158989517 is an equidigital number, since it uses as much as digits as its factorization.

158989517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 53.

The square root of 158989517 is about 12609.1045280781. The cubic root of 158989517 is about 541.7382452259.

The spelling of 158989517 in words is "one hundred fifty-eight million, nine hundred eighty-nine thousand, five hundred seventeen".