158989261 has 2 divisors, whose sum is σ = 158989262. Its totient is φ = 158989260.

The previous prime is 158989231. The next prime is 158989273. The reversal of 158989261 is 162989851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143544361 + 15444900 = 11981^2 + 3930^2 .

It is a cyclic number.

It is not a de Polignac number, because 158989261 - 2¹⁵ = 158956493 is a prime.

It is a super-2 number, since 2×158989261² = 50555170226652242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158989231) 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, 79494630 + 79494631.

It is an arithmetic number, because the mean of its divisors is an integer number (79494631).

Almost surely, 2^158989261 is an apocalyptic number.

It is an amenable number.

158989261 is a deficient number, since it is larger than the sum of its proper divisors (1).

158989261 is an equidigital number, since it uses as much as digits as its factorization.

158989261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 49.

The square root of 158989261 is about 12609.0943766791. The cubic root of 158989261 is about 541.7379544624.

The spelling of 158989261 in words is "one hundred fifty-eight million, nine hundred eighty-nine thousand, two hundred sixty-one".