450317821 has 2 divisors, whose sum is σ = 450317822. Its totient is φ = 450317820.

The previous prime is 450317797. The next prime is 450317831. The reversal of 450317821 is 128713054.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 327972100 + 122345721 = 18110^2 + 11061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-450317821 is a prime.

It is a super-2 number, since 2×450317821² = 405572279820376082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (450317831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225158910 + 225158911.

It is an arithmetic number, because the mean of its divisors is an integer number (225158911).

Almost surely, 2^450317821 is an apocalyptic number.

It is an amenable number.

450317821 is a deficient number, since it is larger than the sum of its proper divisors (1).

450317821 is an equidigital number, since it uses as much as digits as its factorization.

450317821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 450317821 is about 21220.6932261884. The cubic root of 450317821 is about 766.4897967754.

The spelling of 450317821 in words is "four hundred fifty million, three hundred seventeen thousand, eight hundred twenty-one".