3172991 has 2 divisors, whose sum is σ = 3172992. Its totient is φ = 3172990.

The previous prime is 3172987. The next prime is 3172997. The reversal of 3172991 is 1992713.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (1992713) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3172991 - 2² = 3172987 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3172997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1586495 + 1586496.

It is an arithmetic number, because the mean of its divisors is an integer number (1586496).

Almost surely, 2^3172991 is an apocalyptic number.

3172991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3172991 is an equidigital number, since it uses as much as digits as its factorization.

3172991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402, while the sum is 32.

The square root of 3172991 is about 1781.2891399209. The cubic root of 3172991 is about 146.9454963226.

The spelling of 3172991 in words is "three million, one hundred seventy-two thousand, nine hundred ninety-one".