158128281 has 10 divisors (see below), whose sum is σ = 236216442. Its totient is φ = 105418800.

The previous prime is 158128259. The next prime is 158128283. The reversal of 158128281 is 182821851.

158128281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 115670025 + 42458256 = 10755^2 + 6516^2 .

It is not a de Polignac number, because 158128281 - 2⁵ = 158128249 is a prime.

It is a super-2 number, since 2×158128281² = 50009106504029922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (158128283) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 976020 + ... + 976181.

Almost surely, 2^158128281 is an apocalyptic number.

It is an amenable number.

158128281 is a deficient number, since it is larger than the sum of its proper divisors (78088161).

158128281 is an equidigital number, since it uses as much as digits as its factorization.

158128281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1952213 (or 1952204 counting only the distinct ones).

The product of its digits is 10240, while the sum is 36.

The square root of 158128281 is about 12574.9067988594. The cubic root of 158128281 is about 540.7582865414.

The spelling of 158128281 in words is "one hundred fifty-eight million, one hundred twenty-eight thousand, two hundred eighty-one".