158618231 has 4 divisors (see below), whose sum is σ = 158691192. Its totient is φ = 158545272.

The previous prime is 158618219. The next prime is 158618237. The reversal of 158618231 is 132816851.

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 158618231 - 2¹⁴ = 158601847 is a prime.

It is a super-2 number, since 2×158618231² = 50319486411138722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 158618191 and 158618200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158618237) 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, 33116 + ... + 37601.

It is an arithmetic number, because the mean of its divisors is an integer number (39672798).

Almost surely, 2^158618231 is an apocalyptic number.

158618231 is a deficient number, since it is larger than the sum of its proper divisors (72961).

158618231 is an equidigital number, since it uses as much as digits as its factorization.

158618231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72960.

The product of its digits is 11520, while the sum is 35.

The square root of 158618231 is about 12594.3729895537. The cubic root of 158618231 is about 541.3162119448.

The spelling of 158618231 in words is "one hundred fifty-eight million, six hundred eighteen thousand, two hundred thirty-one".