450905909 has 8 divisors (see below), whose sum is σ = 477676440. Its totient is φ = 424162816.

The previous prime is 450905893. The next prime is 450905911. The reversal of 450905909 is 909509054.

It can be written as a sum of positive squares in 4 ways, for example, as 103083409 + 347822500 = 10153^2 + 18650^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 450905909 - 2⁴ = 450905893 is a prime.

It is a super-2 number, since 2×450905909² = 406632277542232562, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (450902909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33977 + ... + 45345.

It is an arithmetic number, because the mean of its divisors is an integer number (59709555).

Almost surely, 2^450905909 is an apocalyptic number.

It is an amenable number.

450905909 is a deficient number, since it is larger than the sum of its proper divisors (26770531).

450905909 is a wasteful number, since it uses less digits than its factorization.

450905909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13719.

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 450905909 is about 21234.5451799656. The cubic root of 450905909 is about 766.8233148298.

The spelling of 450905909 in words is "four hundred fifty million, nine hundred five thousand, nine hundred nine".