158789961 has 36 divisors (see below), whose sum is σ = 255471216. Its totient is φ = 94255200.

The previous prime is 158789959. The next prime is 158789963. The reversal of 158789961 is 169987851.

It is an interprime number because it is at equal distance from previous prime (158789959) and next prime (158789963).

It is not a de Polignac number, because 158789961 - 2¹ = 158789959 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 158789898 and 158789907.

It is not an unprimeable number, because it can be changed into a prime (158789963) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 277806 + ... + 278376.

Almost surely, 2^158789961 is an apocalyptic number.

158789961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

158789961 is a deficient number, since it is larger than the sum of its proper divisors (96681255).

158789961 is a wasteful number, since it uses less digits than its factorization.

158789961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694 (or 638 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 54.

The square root of 158789961 is about 12601.1888724834. The cubic root of 158789961 is about 541.5114957287.

The spelling of 158789961 in words is "one hundred fifty-eight million, seven hundred eighty-nine thousand, nine hundred sixty-one".