158261969 has 2 divisors, whose sum is σ = 158261970. Its totient is φ = 158261968.

The previous prime is 158261947. The next prime is 158261981. The reversal of 158261969 is 969162851.

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., 157753600 + 508369 = 12560^2 + 713^2 .

It is a cyclic number.

It is not a de Polignac number, because 158261969 - 2⁸ = 158261713 is a prime.

It is a super-2 number, since 2×158261969² = 50093701663513922, which contains 22 as substring.

It is a Chen prime.

It is equal to p_8882498 and since 158261969 and 8882498 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (158261269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79130984 + 79130985.

It is an arithmetic number, because the mean of its divisors is an integer number (79130985).

Almost surely, 2^158261969 is an apocalyptic number.

It is an amenable number.

158261969 is a deficient number, since it is larger than the sum of its proper divisors (1).

158261969 is an equidigital number, since it uses as much as digits as its factorization.

158261969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 47.

The square root of 158261969 is about 12580.2213414550. The cubic root of 158261969 is about 540.9106365403.

The spelling of 158261969 in words is "one hundred fifty-eight million, two hundred sixty-one thousand, nine hundred sixty-nine".