450185921 has 2 divisors, whose sum is σ = 450185922. Its totient is φ = 450185920.

The previous prime is 450185909. The next prime is 450185927. The reversal of 450185921 is 129581054.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 257281600 + 192904321 = 16040^2 + 13889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-450185921 is a prime.

It is not a weakly prime, because it can be changed into another prime (450185927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225092960 + 225092961.

It is an arithmetic number, because the mean of its divisors is an integer number (225092961).

Almost surely, 2^450185921 is an apocalyptic number.

It is an amenable number.

450185921 is a deficient number, since it is larger than the sum of its proper divisors (1).

450185921 is an equidigital number, since it uses as much as digits as its factorization.

450185921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 450185921 is about 21217.5851830504. The cubic root of 450185921 is about 766.4149534300.

The spelling of 450185921 in words is "four hundred fifty million, one hundred eighty-five thousand, nine hundred twenty-one".