158015591 has 2 divisors, whose sum is σ = 158015592. Its totient is φ = 158015590.

The previous prime is 158015549. The next prime is 158015621. The reversal of 158015591 is 195510851.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158015591 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 (158015491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79007795 + 79007796.

It is an arithmetic number, because the mean of its divisors is an integer number (79007796).

Almost surely, 2^158015591 is an apocalyptic number.

158015591 is a deficient number, since it is larger than the sum of its proper divisors (1).

158015591 is an equidigital number, since it uses as much as digits as its factorization.

158015591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9000, while the sum is 35.

The square root of 158015591 is about 12570.4252513588. The cubic root of 158015591 is about 540.6297990196.

It can be divided in two parts, 1580 and 15591, that added together give a palindrome (17171).

The spelling of 158015591 in words is "one hundred fifty-eight million, fifteen thousand, five hundred ninety-one".