158604991 has 8 divisors (see below), whose sum is σ = 163268784. Its totient is φ = 154003200.

The previous prime is 158604961. The next prime is 158605003. The reversal of 158604991 is 199406851.

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

It is a cyclic number.

It is not a de Polignac number, because 158604991 - 2⁷ = 158604863 is a prime.

It is a super-2 number, since 2×158604991² = 50311086340220162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158604911) 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 7 ways as a sum of consecutive naturals, for example, 10285 + ... + 20566.

It is an arithmetic number, because the mean of its divisors is an integer number (20408598).

Almost surely, 2^158604991 is an apocalyptic number.

158604991 is a deficient number, since it is larger than the sum of its proper divisors (4663793).

158604991 is an equidigital number, since it uses as much as digits as its factorization.

158604991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31001.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 158604991 is about 12593.8473470183. The cubic root of 158604991 is about 541.3011501493.

The spelling of 158604991 in words is "one hundred fifty-eight million, six hundred four thousand, nine hundred ninety-one".