158181233 has 4 divisors (see below), whose sum is σ = 180778560. Its totient is φ = 135583908.

The previous prime is 158181217. The next prime is 158181241. The reversal of 158181233 is 332181851.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 332181851 = 1831 ⋅181421.

It is a cyclic number.

It is not a de Polignac number, because 158181233 - 2⁴ = 158181217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 158181233.

It is not an unprimeable number, because it can be changed into a prime (158181533) 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, 11298653 + ... + 11298666.

It is an arithmetic number, because the mean of its divisors is an integer number (45194640).

Almost surely, 2^158181233 is an apocalyptic number.

It is an amenable number.

158181233 is a deficient number, since it is larger than the sum of its proper divisors (22597327).

158181233 is an equidigital number, since it uses as much as digits as its factorization.

158181233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22597326.

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

The square root of 158181233 is about 12577.0120855472. The cubic root of 158181233 is about 540.8186405717.

The spelling of 158181233 in words is "one hundred fifty-eight million, one hundred eighty-one thousand, two hundred thirty-three".