33098991 has 4 divisors (see below), whose sum is σ = 44131992. Its totient is φ = 22065992.

The previous prime is 33098957. The next prime is 33098999. The reversal of 33098991 is 19989033.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 33098991 - 2⁹ = 33098479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33098999) 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, 5516496 + ... + 5516501.

It is an arithmetic number, because the mean of its divisors is an integer number (11032998).

Almost surely, 2^33098991 is an apocalyptic number.

33098991 is a deficient number, since it is larger than the sum of its proper divisors (11033001).

33098991 is a wasteful number, since it uses less digits than its factorization.

33098991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11033000.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 33098991 is about 5753.1722553736. The cubic root of 33098991 is about 321.0738371114.

Adding to 33098991 its sum of digits (42), we get a palindrome (33099033).

The spelling of 33098991 in words is "thirty-three million, ninety-eight thousand, nine hundred ninety-one".