2831021 has 4 divisors (see below), whose sum is σ = 2846844. Its totient is φ = 2815200.

The previous prime is 2831011. The next prime is 2831039. The reversal of 2831021 is 1201382.

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 1473796 + 1357225 = 1214^2 + 1165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2831021 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 (2831011) 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, 7640 + ... + 8001.

It is an arithmetic number, because the mean of its divisors is an integer number (711711).

2^2831021 is an apocalyptic number.

It is an amenable number.

2831021 is a deficient number, since it is larger than the sum of its proper divisors (15823).

2831021 is a wasteful number, since it uses less digits than its factorization.

2831021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15822.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 2831021 is about 1682.5638175118. The cubic root of 2831021 is about 141.4645742829.

The spelling of 2831021 in words is "two million, eight hundred thirty-one thousand, twenty-one".