158307991 has 2 divisors, whose sum is σ = 158307992. Its totient is φ = 158307990.

The previous prime is 158307953. The next prime is 158308001. The reversal of 158307991 is 199703851.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 158307991 - 2¹⁵ = 158275223 is a prime.

It is a super-2 number, since 2×158307991² = 50122840028912162, which contains 22 as substring.

It is equal to p_8884915 and since 158307991 and 8884915 have the same sum of digits, it is a Honaker prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158307691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79153995 + 79153996.

It is an arithmetic number, because the mean of its divisors is an integer number (79153996).

Almost surely, 2^158307991 is an apocalyptic number.

158307991 is a deficient number, since it is larger than the sum of its proper divisors (1).

158307991 is an equidigital number, since it uses as much as digits as its factorization.

158307991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 43.

The square root of 158307991 is about 12582.0503496052. The cubic root of 158307991 is about 540.9630630684.

The spelling of 158307991 in words is "one hundred fifty-eight million, three hundred seven thousand, nine hundred ninety-one".