13809331 has 2 divisors, whose sum is σ = 13809332. Its totient is φ = 13809330.

The previous prime is 13809311. The next prime is 13809359. The reversal of 13809331 is 13390831.

It is an a-pointer prime, because the next prime (13809359) can be obtained adding 13809331 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13809331 is a prime.

It is a super-2 number, since 2×13809331² = 381395245335122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13809331.

It is not a weakly prime, because it can be changed into another prime (13809311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6904665 + 6904666.

It is an arithmetic number, because the mean of its divisors is an integer number (6904666).

Almost surely, 2^13809331 is an apocalyptic number.

13809331 is a deficient number, since it is larger than the sum of its proper divisors (1).

13809331 is an equidigital number, since it uses as much as digits as its factorization.

13809331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 13809331 is about 3716.0908223562. The cubic root of 13809331 is about 239.9150799097.

The spelling of 13809331 in words is "thirteen million, eight hundred nine thousand, three hundred thirty-one".