450391261 has 2 divisors, whose sum is σ = 450391262. Its totient is φ = 450391260.

The previous prime is 450391259. The next prime is 450391289. The reversal of 450391261 is 162193054.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 243204025 + 207187236 = 15595^2 + 14394^2 .

It is a cyclic number.

It is not a de Polignac number, because 450391261 - 2¹ = 450391259 is a prime.

Together with 450391259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (450391241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225195630 + 225195631.

It is an arithmetic number, because the mean of its divisors is an integer number (225195631).

Almost surely, 2^450391261 is an apocalyptic number.

It is an amenable number.

450391261 is a deficient number, since it is larger than the sum of its proper divisors (1).

450391261 is an equidigital number, since it uses as much as digits as its factorization.

450391261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 450391261 is about 21222.4235420934. The cubic root of 450391261 is about 766.5314621269.

The spelling of 450391261 in words is "four hundred fifty million, three hundred ninety-one thousand, two hundred sixty-one".