158297991 has 8 divisors (see below), whose sum is σ = 211417584. Its totient is φ = 105355200.

The previous prime is 158297969. The next prime is 158298053. The reversal of 158297991 is 199792851.

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

It is not a de Polignac number, because 158297991 - 2⁵ = 158297959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158297791) 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, 42096 + ... + 45701.

It is an arithmetic number, because the mean of its divisors is an integer number (26427198).

Almost surely, 2^158297991 is an apocalyptic number.

158297991 is a deficient number, since it is larger than the sum of its proper divisors (53119593).

158297991 is an equidigital number, since it uses as much as digits as its factorization.

158297991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88401.

The product of its digits is 408240, while the sum is 51.

The square root of 158297991 is about 12581.6529518184. The cubic root of 158297991 is about 540.9516723093.

The spelling of 158297991 in words is "one hundred fifty-eight million, two hundred ninety-seven thousand, nine hundred ninety-one".