158328991 has 2 divisors, whose sum is σ = 158328992. Its totient is φ = 158328990.

The previous prime is 158328983. The next prime is 158329001. The reversal of 158328991 is 199823851.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 158328991 - 2³ = 158328983 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158328091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79164495 + 79164496.

It is an arithmetic number, because the mean of its divisors is an integer number (79164496).

Almost surely, 2^158328991 is an apocalyptic number.

158328991 is a deficient number, since it is larger than the sum of its proper divisors (1).

158328991 is an equidigital number, since it uses as much as digits as its factorization.

158328991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 46.

The square root of 158328991 is about 12582.8848441047. The cubic root of 158328991 is about 540.9869821011.

The spelling of 158328991 in words is "one hundred fifty-eight million, three hundred twenty-eight thousand, nine hundred ninety-one".