158813231 has 4 divisors (see below), whose sum is σ = 158850000. Its totient is φ = 158776464.

The previous prime is 158813197. The next prime is 158813261. The reversal of 158813231 is 132318851.

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

It is a cyclic number.

It is not a de Polignac number, because 158813231 - 2¹⁸ = 158551087 is a prime.

It is a super-2 number, since 2×158813231² = 50443284681318722, 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 (158813261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10886 + ... + 20883.

It is an arithmetic number, because the mean of its divisors is an integer number (39712500).

Almost surely, 2^158813231 is an apocalyptic number.

158813231 is a deficient number, since it is larger than the sum of its proper divisors (36769).

158813231 is an equidigital number, since it uses as much as digits as its factorization.

158813231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36768.

The product of its digits is 5760, while the sum is 32.

The square root of 158813231 is about 12602.1121642366. The cubic root of 158813231 is about 541.5379465130.

The spelling of 158813231 in words is "one hundred fifty-eight million, eight hundred thirteen thousand, two hundred thirty-one".