2821631 has 4 divisors (see below), whose sum is σ = 2836152. Its totient is φ = 2807112.

The previous prime is 2821627. The next prime is 2821649. The reversal of 2821631 is 1361282.

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

It is a cyclic number.

It is not a de Polignac number, because 2821631 - 2² = 2821627 is a prime.

It is a super-2 number, since 2×2821631² = 15923203000322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2821597 and 2821606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2821601) 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, 6965 + ... + 7358.

It is an arithmetic number, because the mean of its divisors is an integer number (709038).

2^2821631 is an apocalyptic number.

2821631 is a deficient number, since it is larger than the sum of its proper divisors (14521).

2821631 is a wasteful number, since it uses less digits than its factorization.

2821631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14520.

The product of its digits is 576, while the sum is 23.

The square root of 2821631 is about 1679.7711153607. The cubic root of 2821631 is about 141.3079966498.

The spelling of 2821631 in words is "two million, eight hundred twenty-one thousand, six hundred thirty-one".