3309991 has 2 divisors, whose sum is σ = 3309992. Its totient is φ = 3309990.

The previous prime is 3309979. The next prime is 3309997. The reversal of 3309991 is 1999033.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1999033) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3309991 - 2¹³ = 3301799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3309997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1654995 + 1654996.

It is an arithmetic number, because the mean of its divisors is an integer number (1654996).

Almost surely, 2^3309991 is an apocalyptic number.

3309991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3309991 is an equidigital number, since it uses as much as digits as its factorization.

3309991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6561, while the sum is 34.

The square root of 3309991 is about 1819.3380664406. The cubic root of 3309991 is about 149.0306529731.

The spelling of 3309991 in words is "three million, three hundred nine thousand, nine hundred ninety-one".