906057821 has 2 divisors, whose sum is σ = 906057822. Its totient is φ = 906057820.

The previous prime is 906057809. The next prime is 906057829. The reversal of 906057821 is 128750609.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 526197721 + 379860100 = 22939^2 + 19490^2 .

It is a cyclic number.

It is not a de Polignac number, because 906057821 - 2¹⁰ = 906056797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (906057829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 453028910 + 453028911.

It is an arithmetic number, because the mean of its divisors is an integer number (453028911).

Almost surely, 2^906057821 is an apocalyptic number.

It is an amenable number.

906057821 is a deficient number, since it is larger than the sum of its proper divisors (1).

906057821 is an equidigital number, since it uses as much as digits as its factorization.

906057821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 906057821 is about 30100.7943582890. The cubic root of 906057821 is about 967.6507506129.

The spelling of 906057821 in words is "nine hundred six million, fifty-seven thousand, eight hundred twenty-one".