158689231 has 2 divisors, whose sum is σ = 158689232. Its totient is φ = 158689230.

The previous prime is 158689207. The next prime is 158689241. The reversal of 158689231 is 132986851.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 158689231 - 2¹⁹ = 158164943 is a prime.

It is a super-2 number, since 2×158689231² = 50364544070742722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158689241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79344615 + 79344616.

It is an arithmetic number, because the mean of its divisors is an integer number (79344616).

Almost surely, 2^158689231 is an apocalyptic number.

158689231 is a deficient number, since it is larger than the sum of its proper divisors (1).

158689231 is an equidigital number, since it uses as much as digits as its factorization.

158689231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 43.

The square root of 158689231 is about 12597.1913933226. The cubic root of 158689231 is about 541.3969670966.

The spelling of 158689231 in words is "one hundred fifty-eight million, six hundred eighty-nine thousand, two hundred thirty-one".