158392981 has 6 divisors (see below), whose sum is σ = 163668246. Its totient is φ = 153282600.

The previous prime is 158392979. The next prime is 158392999. The reversal of 158392981 is 189293851.

It can be written as a sum of positive squares in only one way, i.e., 114383025 + 44009956 = 10695^2 + 6634^2 .

It is not a de Polignac number, because 158392981 - 2¹ = 158392979 is a prime.

It is a super-2 number, since 2×158392981² = 50176672860132722, 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 (158392681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 81450 + ... + 83371.

It is an arithmetic number, because the mean of its divisors is an integer number (27278041).

Almost surely, 2^158392981 is an apocalyptic number.

It is an amenable number.

158392981 is a deficient number, since it is larger than the sum of its proper divisors (5275265).

158392981 is an equidigital number, since it uses as much as digits as its factorization.

158392981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164883 (or 164852 counting only the distinct ones).

The product of its digits is 155520, while the sum is 46.

The square root of 158392981 is about 12585.4273268729. The cubic root of 158392981 is about 541.0598537719.

The spelling of 158392981 in words is "one hundred fifty-eight million, three hundred ninety-two thousand, nine hundred eighty-one".