158689997 has 2 divisors, whose sum is σ = 158689998. Its totient is φ = 158689996.

The previous prime is 158689933. The next prime is 158690017. The reversal of 158689997 is 799986851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138744841 + 19945156 = 11779^2 + 4466^2 .

It is a cyclic number.

It is not a de Polignac number, because 158689997 - 2⁶ = 158689933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158680997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79344998 + 79344999.

It is an arithmetic number, because the mean of its divisors is an integer number (79344999).

Almost surely, 2^158689997 is an apocalyptic number.

It is an amenable number.

158689997 is a deficient number, since it is larger than the sum of its proper divisors (1).

158689997 is an equidigital number, since it uses as much as digits as its factorization.

158689997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9797760, while the sum is 62.

The square root of 158689997 is about 12597.2217968884. The cubic root of 158689997 is about 541.3978382110.

The spelling of 158689997 in words is "one hundred fifty-eight million, six hundred eighty-nine thousand, nine hundred ninety-seven".