2005631 has 8 divisors (see below), whose sum is σ = 2069760. Its totient is φ = 1942488.

The previous prime is 2005613. The next prime is 2005667. The reversal of 2005631 is 1365002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2005631 - 2⁶ = 2005567 is a prime.

It is a super-2 number, since 2×2005631² = 8045111416322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6380 + ... + 6686.

It is an arithmetic number, because the mean of its divisors is an integer number (258720).

2^2005631 is an apocalyptic number.

2005631 is a deficient number, since it is larger than the sum of its proper divisors (64129).

2005631 is a wasteful number, since it uses less digits than its factorization.

2005631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 2005631 is about 1416.2030221688. The cubic root of 2005631 is about 126.1102377817.

The spelling of 2005631 in words is "two million, five thousand, six hundred thirty-one".