3891197 has 2 divisors, whose sum is σ = 3891198. Its totient is φ = 3891196.

The previous prime is 3891161. The next prime is 3891203. The reversal of 3891197 is 7911983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2477476 + 1413721 = 1574^2 + 1189^2 .

It is a cyclic number.

It is not a de Polignac number, because 3891197 - 2¹⁸ = 3629053 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3891197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3891137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1945598 + 1945599.

It is an arithmetic number, because the mean of its divisors is an integer number (1945599).

Almost surely, 2^3891197 is an apocalyptic number.

It is an amenable number.

3891197 is a deficient number, since it is larger than the sum of its proper divisors (1).

3891197 is an equidigital number, since it uses as much as digits as its factorization.

3891197 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 3891197 is about 1972.6117205370. The cubic root of 3891197 is about 157.2875711773.

The spelling of 3891197 in words is "three million, eight hundred ninety-one thousand, one hundred ninety-seven".