457455821 has 2 divisors, whose sum is σ = 457455822. Its totient is φ = 457455820.

The previous prime is 457455797. The next prime is 457455829. The reversal of 457455821 is 128554754.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 417589225 + 39866596 = 20435^2 + 6314^2 .

It is a cyclic number.

It is not a de Polignac number, because 457455821 - 2²² = 453261517 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 (457455829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 228727910 + 228727911.

It is an arithmetic number, because the mean of its divisors is an integer number (228727911).

Almost surely, 2^457455821 is an apocalyptic number.

It is an amenable number.

457455821 is a deficient number, since it is larger than the sum of its proper divisors (1).

457455821 is an equidigital number, since it uses as much as digits as its factorization.

457455821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 224000, while the sum is 41.

The square root of 457455821 is about 21388.2168728485. The cubic root of 457455821 is about 770.5184684941.

The spelling of 457455821 in words is "four hundred fifty-seven million, four hundred fifty-five thousand, eight hundred twenty-one".