3591989 has 2 divisors, whose sum is σ = 3591990. Its totient is φ = 3591988.

The previous prime is 3591977. The next prime is 3592009. The reversal of 3591989 is 9891953.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2656900 + 935089 = 1630^2 + 967^2 .

It is an emirp because it is prime and its reverse (9891953) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3591989 - 2⁸ = 3591733 is a prime.

It is a super-2 number, since 2×3591989² = 25804769952242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3591949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1795994 + 1795995.

It is an arithmetic number, because the mean of its divisors is an integer number (1795995).

Almost surely, 2^3591989 is an apocalyptic number.

It is an amenable number.

3591989 is a deficient number, since it is larger than the sum of its proper divisors (1).

3591989 is an equidigital number, since it uses as much as digits as its factorization.

3591989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87480, while the sum is 44.

The square root of 3591989 is about 1895.2543364942. The cubic root of 3591989 is about 153.1481186252.

The spelling of 3591989 in words is "three million, five hundred ninety-one thousand, nine hundred eighty-nine".