3691811 has 2 divisors, whose sum is σ = 3691812. Its totient is φ = 3691810.

The previous prime is 3691801. The next prime is 3691813. The reversal of 3691811 is 1181963.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1181963) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3691811 - 2⁶ = 3691747 is a prime.

Together with 3691813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3691813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1845905 + 1845906.

It is an arithmetic number, because the mean of its divisors is an integer number (1845906).

Almost surely, 2^3691811 is an apocalyptic number.

3691811 is a deficient number, since it is larger than the sum of its proper divisors (1).

3691811 is an equidigital number, since it uses as much as digits as its factorization.

3691811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 29.

The square root of 3691811 is about 1921.4085978781. The cubic root of 3691811 is about 154.5538470959.

The spelling of 3691811 in words is "three million, six hundred ninety-one thousand, eight hundred eleven".