158436991 has 16 divisors (see below), whose sum is σ = 177120000. Its totient is φ = 140842368.

The previous prime is 158436989. The next prime is 158437003. The reversal of 158436991 is 199634851.

It is a cyclic number.

It is not a de Polignac number, because 158436991 - 2¹ = 158436989 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 (158436911) 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 in 15 ways as a sum of consecutive naturals, for example, 160686 + ... + 161668.

It is an arithmetic number, because the mean of its divisors is an integer number (11070000).

Almost surely, 2^158436991 is an apocalyptic number.

158436991 is a deficient number, since it is larger than the sum of its proper divisors (18683009).

158436991 is a wasteful number, since it uses less digits than its factorization.

158436991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1518.

The product of its digits is 233280, while the sum is 46.

The square root of 158436991 is about 12587.1756561987. The cubic root of 158436991 is about 541.1099608725.

The spelling of 158436991 in words is "one hundred fifty-eight million, four hundred thirty-six thousand, nine hundred ninety-one".