13233991 has 2 divisors, whose sum is σ = 13233992. Its totient is φ = 13233990.

The previous prime is 13233989. The next prime is 13234003. The reversal of 13233991 is 19933231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13233991 - 2¹ = 13233989 is a prime.

Together with 13233989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13233911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6616995 + 6616996.

It is an arithmetic number, because the mean of its divisors is an integer number (6616996).

Almost surely, 2^13233991 is an apocalyptic number.

13233991 is a deficient number, since it is larger than the sum of its proper divisors (1).

13233991 is an equidigital number, since it uses as much as digits as its factorization.

13233991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4374, while the sum is 31.

The square root of 13233991 is about 3637.8552747464. The cubic root of 13233991 is about 236.5358348053.

The spelling of 13233991 in words is "thirteen million, two hundred thirty-three thousand, nine hundred ninety-one".