32989991 has 4 divisors (see below), whose sum is σ = 33330192. Its totient is φ = 32649792.

The previous prime is 32989967. The next prime is 32990003. The reversal of 32989991 is 19998923.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-32989991 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 (32989091) 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, 169955 + ... + 170148.

It is an arithmetic number, because the mean of its divisors is an integer number (8332548).

Almost surely, 2^32989991 is an apocalyptic number.

32989991 is a deficient number, since it is larger than the sum of its proper divisors (340201).

32989991 is an equidigital number, since it uses as much as digits as its factorization.

32989991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340200.

The product of its digits is 314928, while the sum is 50.

The square root of 32989991 is about 5743.6914088415. The cubic root of 32989991 is about 320.7210012244.

The spelling of 32989991 in words is "thirty-two million, nine hundred eighty-nine thousand, nine hundred ninety-one".