3931997 has 2 divisors, whose sum is σ = 3931998. Its totient is φ = 3931996.

The previous prime is 3931969. The next prime is 3932003. The reversal of 3931997 is 7991393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3345241 + 586756 = 1829^2 + 766^2 .

It is a cyclic number.

It is not a de Polignac number, because 3931997 - 2⁶ = 3931933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3931927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1965998 + 1965999.

It is an arithmetic number, because the mean of its divisors is an integer number (1965999).

Almost surely, 2^3931997 is an apocalyptic number.

It is an amenable number.

3931997 is a deficient number, since it is larger than the sum of its proper divisors (1).

3931997 is an equidigital number, since it uses as much as digits as its factorization.

3931997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45927, while the sum is 41.

The square root of 3931997 is about 1982.9263728137. The cubic root of 3931997 is about 157.8353917778.

The spelling of 3931997 in words is "three million, nine hundred thirty-one thousand, nine hundred ninety-seven".