33158989 has 4 divisors (see below), whose sum is σ = 33170656. Its totient is φ = 33147324.

The previous prime is 33158981. The next prime is 33159001. The reversal of 33158989 is 98985133.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 33158989 - 2³ = 33158981 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 (33158981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1522 + ... + 8284.

It is an arithmetic number, because the mean of its divisors is an integer number (8292664).

Almost surely, 2^33158989 is an apocalyptic number.

It is an amenable number.

33158989 is a deficient number, since it is larger than the sum of its proper divisors (11667).

33158989 is an equidigital number, since it uses as much as digits as its factorization.

33158989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11666.

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

The square root of 33158989 is about 5758.3842351826. The cubic root of 33158989 is about 321.2677217737.

The spelling of 33158989 in words is "thirty-three million, one hundred fifty-eight thousand, nine hundred eighty-nine".