453972821 has 2 divisors, whose sum is σ = 453972822. Its totient is φ = 453972820.

The previous prime is 453972763. The next prime is 453972917. The reversal of 453972821 is 128279354.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302412100 + 151560721 = 17390^2 + 12311^2 .

It is a cyclic number.

It is not a de Polignac number, because 453972821 - 2¹⁰ = 453971797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (453972521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 226986410 + 226986411.

It is an arithmetic number, because the mean of its divisors is an integer number (226986411).

Almost surely, 2^453972821 is an apocalyptic number.

It is an amenable number.

453972821 is a deficient number, since it is larger than the sum of its proper divisors (1).

453972821 is an equidigital number, since it uses as much as digits as its factorization.

453972821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 41.

The square root of 453972821 is about 21306.6379562802. The cubic root of 453972821 is about 768.5579469921.

The spelling of 453972821 in words is "four hundred fifty-three million, nine hundred seventy-two thousand, eight hundred twenty-one".