33397331 has 6 divisors (see below), whose sum is σ = 36709596. Its totient is φ = 30361100.

The previous prime is 33397321. The next prime is 33397349. The reversal of 33397331 is 13379333.

It is a happy number.

It is not a de Polignac number, because 33397331 - 2⁶ = 33397267 is a prime.

It is a super-2 number, since 2×33397331² = 2230763435847122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (33397321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 137885 + ... + 138126.

It is an arithmetic number, because the mean of its divisors is an integer number (6118266).

Almost surely, 2^33397331 is an apocalyptic number.

33397331 is a deficient number, since it is larger than the sum of its proper divisors (3312265).

33397331 is a wasteful number, since it uses less digits than its factorization.

33397331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276033 (or 276022 counting only the distinct ones).

The product of its digits is 15309, while the sum is 32.

The square root of 33397331 is about 5779.0423947225. The cubic root of 33397331 is about 322.0356267564.

The spelling of 33397331 in words is "thirty-three million, three hundred ninety-seven thousand, three hundred thirty-one".