158011989 has 4 divisors (see below), whose sum is σ = 210682656. Its totient is φ = 105341324.

The previous prime is 158011969. The next prime is 158011993. The reversal of 158011989 is 989110851.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 158011989 - 2²³ = 149623381 is a prime.

It is a super-2 number, since 2×158011989² = 49935577335472242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 158011989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158011939) 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 in 3 ways as a sum of consecutive naturals, for example, 26335329 + ... + 26335334.

It is an arithmetic number, because the mean of its divisors is an integer number (52670664).

Almost surely, 2^158011989 is an apocalyptic number.

It is an amenable number.

158011989 is a deficient number, since it is larger than the sum of its proper divisors (52670667).

158011989 is an equidigital number, since it uses as much as digits as its factorization.

158011989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52670666.

The product of its (nonzero) digits is 25920, while the sum is 42.

The square root of 158011989 is about 12570.2819777442. The cubic root of 158011989 is about 540.6256910635.

The spelling of 158011989 in words is "one hundred fifty-eight million, eleven thousand, nine hundred eighty-nine".