158458991 has 8 divisors (see below), whose sum is σ = 159451824. Its totient is φ = 157469760.

The previous prime is 158458981. The next prime is 158458997. The reversal of 158458991 is 199854851.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 158458991 - 2¹⁸ = 158196847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158458997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180245 + ... + 181121.

It is an arithmetic number, because the mean of its divisors is an integer number (19931478).

Almost surely, 2^158458991 is an apocalyptic number.

158458991 is a deficient number, since it is larger than the sum of its proper divisors (992833).

158458991 is an equidigital number, since it uses as much as digits as its factorization.

158458991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1801.

The product of its digits is 518400, while the sum is 50.

The square root of 158458991 is about 12588.0495312022. The cubic root of 158458991 is about 541.1350052515.

The spelling of 158458991 in words is "one hundred fifty-eight million, four hundred fifty-eight thousand, nine hundred ninety-one".