158889681 has 24 divisors (see below), whose sum is σ = 248364480. Its totient is φ = 101317392.

The previous prime is 158889677. The next prime is 158889697. The reversal of 158889681 is 186988851.

It is not a de Polignac number, because 158889681 - 2² = 158889677 is a prime.

It is a super-2 number, since 2×158889681² = 50491861456563522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (158889631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8626 + ... + 19803.

It is an arithmetic number, because the mean of its divisors is an integer number (10348520).

Almost surely, 2^158889681 is an apocalyptic number.

It is an amenable number.

158889681 is a deficient number, since it is larger than the sum of its proper divisors (89474799).

158889681 is an equidigital number, since it uses as much as digits as its factorization.

158889681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28467 (or 28455 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 54.

The square root of 158889681 is about 12605.1450209825. The cubic root of 158889681 is about 541.6248283056.

The spelling of 158889681 in words is "one hundred fifty-eight million, eight hundred eighty-nine thousand, six hundred eighty-one".