821479453 has 2 divisors, whose sum is σ = 821479454. Its totient is φ = 821479452.

The previous prime is 821479427. The next prime is 821479471. The reversal of 821479453 is 354974128.

821479453 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 479303449 + 342176004 = 21893^2 + 18498^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-821479453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821179453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410739726 + 410739727.

It is an arithmetic number, because the mean of its divisors is an integer number (410739727).

Almost surely, 2^821479453 is an apocalyptic number.

It is an amenable number.

821479453 is a deficient number, since it is larger than the sum of its proper divisors (1).

821479453 is an equidigital number, since it uses as much as digits as its factorization.

821479453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 43.

The square root of 821479453 is about 28661.4628551998. The cubic root of 821479453 is about 936.5527320261.

The spelling of 821479453 in words is "eight hundred twenty-one million, four hundred seventy-nine thousand, four hundred fifty-three".