158611969 has 4 divisors (see below), whose sum is σ = 158643540. Its totient is φ = 158580400.

The previous prime is 158611961. The next prime is 158611997. The reversal of 158611969 is 969116851.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 969116851 = 487 ⋅1989973.

It can be written as a sum of positive squares in 2 ways, for example, as 76038400 + 82573569 = 8720^2 + 9087^2 .

It is a cyclic number.

It is not a de Polignac number, because 158611969 - 2³ = 158611961 is a prime.

It is a super-2 number, since 2×158611969² = 50315513420113922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158611961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6382 + ... + 18919.

It is an arithmetic number, because the mean of its divisors is an integer number (39660885).

Almost surely, 2^158611969 is an apocalyptic number.

It is an amenable number.

158611969 is a deficient number, since it is larger than the sum of its proper divisors (31571).

158611969 is an equidigital number, since it uses as much as digits as its factorization.

158611969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31570.

The product of its digits is 116640, while the sum is 46.

The square root of 158611969 is about 12594.1243840134. The cubic root of 158611969 is about 541.3090884115.

The spelling of 158611969 in words is "one hundred fifty-eight million, six hundred eleven thousand, nine hundred sixty-nine".