33921989 has 2 divisors, whose sum is σ = 33921990. Its totient is φ = 33921988.

The previous prime is 33921983. The next prime is 33921997. The reversal of 33921989 is 98912933.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26604964 + 7317025 = 5158^2 + 2705^2 .

It is a cyclic number.

It is not a de Polignac number, because 33921989 - 2²⁰ = 32873413 is a prime.

It is a super-2 number, since 2×33921989² = 2301402675432242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33921983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16960994 + 16960995.

It is an arithmetic number, because the mean of its divisors is an integer number (16960995).

Almost surely, 2^33921989 is an apocalyptic number.

It is an amenable number.

33921989 is a deficient number, since it is larger than the sum of its proper divisors (1).

33921989 is an equidigital number, since it uses as much as digits as its factorization.

33921989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 44.

The square root of 33921989 is about 5824.2586652723. The cubic root of 33921989 is about 323.7132204309.

The spelling of 33921989 in words is "thirty-three million, nine hundred twenty-one thousand, nine hundred eighty-nine".