3198991 has 2 divisors, whose sum is σ = 3198992. Its totient is φ = 3198990.

The previous prime is 3198977. The next prime is 3198997. The reversal of 3198991 is 1998913.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3198991 - 2⁵ = 3198959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3198997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1599495 + 1599496.

It is an arithmetic number, because the mean of its divisors is an integer number (1599496).

Almost surely, 2^3198991 is an apocalyptic number.

3198991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3198991 is an equidigital number, since it uses as much as digits as its factorization.

3198991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 40.

The square root of 3198991 is about 1788.5723356912. The cubic root of 3198991 is about 147.3457700350.

The spelling of 3198991 in words is "three million, one hundred ninety-eight thousand, nine hundred ninety-one".