158612981 has 4 divisors (see below), whose sum is σ = 158653452. Its totient is φ = 158572512.

The previous prime is 158612963. The next prime is 158612989. The reversal of 158612981 is 189216851.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 115906756 + 42706225 = 10766^2 + 6535^2 .

It is a cyclic number.

It is not a de Polignac number, because 158612981 - 2¹⁴ = 158596597 is a prime.

It is a super-2 number, since 2×158612981² = 50316155483412722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158612989) 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 3 ways as a sum of consecutive naturals, for example, 13640 + ... + 22433.

It is an arithmetic number, because the mean of its divisors is an integer number (39663363).

Almost surely, 2^158612981 is an apocalyptic number.

It is an amenable number.

158612981 is a deficient number, since it is larger than the sum of its proper divisors (40471).

158612981 is an equidigital number, since it uses as much as digits as its factorization.

158612981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40470.

The product of its digits is 34560, while the sum is 41.

The square root of 158612981 is about 12594.1645614149. The cubic root of 158612981 is about 541.3102396564.

The spelling of 158612981 in words is "one hundred fifty-eight million, six hundred twelve thousand, nine hundred eighty-one".