450221531 has 2 divisors, whose sum is σ = 450221532. Its totient is φ = 450221530.

The previous prime is 450221503. The next prime is 450221537. The reversal of 450221531 is 135122054.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 450221531 - 2⁶ = 450221467 is a prime.

It is a super-2 number, since 2×450221531² = 405398853951967922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 450221497 and 450221506.

It is not a weakly prime, because it can be changed into another prime (450221537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225110765 + 225110766.

It is an arithmetic number, because the mean of its divisors is an integer number (225110766).

Almost surely, 2^450221531 is an apocalyptic number.

450221531 is a deficient number, since it is larger than the sum of its proper divisors (1).

450221531 is an equidigital number, since it uses as much as digits as its factorization.

450221531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 450221531 is about 21218.4243288704. The cubic root of 450221531 is about 766.4351608714.

Adding to 450221531 its reverse (135122054), we get a palindrome (585343585).

The spelling of 450221531 in words is "four hundred fifty million, two hundred twenty-one thousand, five hundred thirty-one".