457271821 has 2 divisors, whose sum is σ = 457271822. Its totient is φ = 457271820.

The previous prime is 457271783. The next prime is 457271833. The reversal of 457271821 is 128172754.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 434097225 + 23174596 = 20835^2 + 4814^2 .

It is a cyclic number.

It is not a de Polignac number, because 457271821 - 2²³ = 448883213 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 (457271021) 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, 228635910 + 228635911.

It is an arithmetic number, because the mean of its divisors is an integer number (228635911).

Almost surely, 2^457271821 is an apocalyptic number.

It is an amenable number.

457271821 is a deficient number, since it is larger than the sum of its proper divisors (1).

457271821 is an equidigital number, since it uses as much as digits as its factorization.

457271821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31360, while the sum is 37.

The square root of 457271821 is about 21383.9150063780. The cubic root of 457271821 is about 770.4151474706.

The spelling of 457271821 in words is "four hundred fifty-seven million, two hundred seventy-one thousand, eight hundred twenty-one".