3651997 has 2 divisors, whose sum is σ = 3651998. Its totient is φ = 3651996.

The previous prime is 3651983. The next prime is 3652007. The reversal of 3651997 is 7991563.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3606201 + 45796 = 1899^2 + 214^2 .

It is an emirp because it is prime and its reverse (7991563) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3651997 - 2¹¹ = 3649949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3651497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1825998 + 1825999.

It is an arithmetic number, because the mean of its divisors is an integer number (1825999).

Almost surely, 2^3651997 is an apocalyptic number.

It is an amenable number.

3651997 is a deficient number, since it is larger than the sum of its proper divisors (1).

3651997 is an equidigital number, since it uses as much as digits as its factorization.

3651997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51030, while the sum is 40.

The square root of 3651997 is about 1911.0198847736. The cubic root of 3651997 is about 153.9962471678.

The spelling of 3651997 in words is "three million, six hundred fifty-one thousand, nine hundred ninety-seven".