158817961 has 8 divisors (see below), whose sum is σ = 168333984. Its totient is φ = 149321280.

The previous prime is 158817959. The next prime is 158817973. The reversal of 158817961 is 169718851.

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 158817961 - 2¹ = 158817959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158817931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14266 + ... + 22828.

It is an arithmetic number, because the mean of its divisors is an integer number (21041748).

Almost surely, 2^158817961 is an apocalyptic number.

It is an amenable number.

158817961 is a deficient number, since it is larger than the sum of its proper divisors (9516023).

158817961 is a wasteful number, since it uses less digits than its factorization.

158817961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9671.

The product of its digits is 120960, while the sum is 46.

The square root of 158817961 is about 12602.2998297930. The cubic root of 158817961 is about 541.5433227423.

The spelling of 158817961 in words is "one hundred fifty-eight million, eight hundred seventeen thousand, nine hundred sixty-one".