2972821 has 2 divisors, whose sum is σ = 2972822. Its totient is φ = 2972820.

The previous prime is 2972803. The next prime is 2972831. The reversal of 2972821 is 1282792.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2292196 + 680625 = 1514^2 + 825^2 .

It is a cyclic number.

It is not a de Polignac number, because 2972821 - 2⁵ = 2972789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2972831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1486410 + 1486411.

It is an arithmetic number, because the mean of its divisors is an integer number (1486411).

2^2972821 is an apocalyptic number.

It is an amenable number.

2972821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2972821 is an equidigital number, since it uses as much as digits as its factorization.

2972821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 31.

The square root of 2972821 is about 1724.1870548174. The cubic root of 2972821 is about 143.7880917327.

The spelling of 2972821 in words is "two million, nine hundred seventy-two thousand, eight hundred twenty-one".