3591997 has 4 divisors (see below), whose sum is σ = 3689116. Its totient is φ = 3494880.

The previous prime is 3591989. The next prime is 3592009. The reversal of 3591997 is 7991953.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3290596 + 301401 = 1814^2 + 549^2 .

It is a cyclic number.

It is not a de Polignac number, because 3591997 - 2³ = 3591989 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3591967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48504 + ... + 48577.

It is an arithmetic number, because the mean of its divisors is an integer number (922279).

Almost surely, 2^3591997 is an apocalyptic number.

3591997 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

3591997 is a deficient number, since it is larger than the sum of its proper divisors (97119).

3591997 is an equidigital number, since it uses as much as digits as its factorization.

3591997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97118.

The product of its digits is 76545, while the sum is 43.

The square root of 3591997 is about 1895.2564470277. The cubic root of 3591997 is about 153.1482323212.

The spelling of 3591997 in words is "three million, five hundred ninety-one thousand, nine hundred ninety-seven".