3171989 has 2 divisors, whose sum is σ = 3171990. Its totient is φ = 3171988.

The previous prime is 3171977. The next prime is 3172003. The reversal of 3171989 is 9891713.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2739025 + 432964 = 1655^2 + 658^2 .

It is a cyclic number.

It is not a de Polignac number, because 3171989 - 2⁸ = 3171733 is a prime.

It is a super-2 number, since 2×3171989² = 20123028432242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3171089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1585994 + 1585995.

It is an arithmetic number, because the mean of its divisors is an integer number (1585995).

Almost surely, 2^3171989 is an apocalyptic number.

It is an amenable number.

3171989 is a deficient number, since it is larger than the sum of its proper divisors (1).

3171989 is an equidigital number, since it uses as much as digits as its factorization.

3171989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 38.

The square root of 3171989 is about 1781.0078607350. The cubic root of 3171989 is about 146.9300267032.

The spelling of 3171989 in words is "three million, one hundred seventy-one thousand, nine hundred eighty-nine".