158947999 has 4 divisors (see below), whose sum is σ = 181654864. Its totient is φ = 136241136.

The previous prime is 158947981. The next prime is 158948087. The reversal of 158947999 is 999749851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999749851 = 1091 ⋅916361.

It is a cyclic number.

It is not a de Polignac number, because 158947999 - 2²³ = 150559391 is a prime.

It is a super-2 number, since 2×158947999² = 50528932772208002, 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 (158947969) 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 3 ways as a sum of consecutive naturals, for example, 11353422 + ... + 11353435.

It is an arithmetic number, because the mean of its divisors is an integer number (45413716).

Almost surely, 2^158947999 is an apocalyptic number.

158947999 is a deficient number, since it is larger than the sum of its proper divisors (22706865).

158947999 is an equidigital number, since it uses as much as digits as its factorization.

158947999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22706864.

The product of its digits is 7348320, while the sum is 61.

The square root of 158947999 is about 12607.4580705232. The cubic root of 158947999 is about 541.6910852056.

The spelling of 158947999 in words is "one hundred fifty-eight million, nine hundred forty-seven thousand, nine hundred ninety-nine".