158961 has 8 divisors (see below), whose sum is σ = 231264. Its totient is φ = 96320.

The previous prime is 158959. The next prime is 158981. The reversal of 158961 is 169851.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 158961 - 2¹ = 158959 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (158941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2376 + ... + 2441.

It is an arithmetic number, because the mean of its divisors is an integer number (28908).

2¹⁵⁸⁹⁶¹ is an apocalyptic number.

158961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

158961 is a deficient number, since it is larger than the sum of its proper divisors (72303).

158961 is a wasteful number, since it uses less digits than its factorization.

158961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4831.

The product of its digits is 2160, while the sum is 30.

The square root of 158961 is about 398.6991346868. The cubic root of 158961 is about 54.1705853838.

The spelling of 158961 in words is "one hundred fifty-eight thousand, nine hundred sixty-one".