3611891 has 2 divisors, whose sum is σ = 3611892. Its totient is φ = 3611890.

The previous prime is 3611873. The next prime is 3611893. The reversal of 3611891 is 1981163.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3611891 - 2⁶ = 3611827 is a prime.

Together with 3611893, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (3611893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1805945 + 1805946.

It is an arithmetic number, because the mean of its divisors is an integer number (1805946).

Almost surely, 2^3611891 is an apocalyptic number.

3611891 is a deficient number, since it is larger than the sum of its proper divisors (1).

3611891 is an equidigital number, since it uses as much as digits as its factorization.

3611891 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 3611891 is about 1900.4975664283. The cubic root of 3611891 is about 153.4304452036.

The spelling of 3611891 in words is "three million, six hundred eleven thousand, eight hundred ninety-one".