451620505 has 12 divisors (see below), whose sum is σ = 630425700. Its totient is φ = 309682464.

The previous prime is 451620503. The next prime is 451620511. The reversal of 451620505 is 505026154.

It can be written as a sum of positive squares in 2 ways, for example, as 194435136 + 257185369 = 13944^2 + 16037^2 .

It is not a de Polignac number, because 451620505 - 2¹ = 451620503 is a prime.

It is a super-2 number, since 2×451620505² = 407922161072910050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451620503) 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 in 11 ways as a sum of consecutive naturals, for example, 921430 + ... + 921919.

It is an arithmetic number, because the mean of its divisors is an integer number (52535475).

Almost surely, 2^451620505 is an apocalyptic number.

It is an amenable number.

451620505 is a deficient number, since it is larger than the sum of its proper divisors (178805195).

451620505 is a wasteful number, since it uses less digits than its factorization.

451620505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843368 (or 1843361 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 451620505 is about 21251.3647797030. The cubic root of 451620505 is about 767.2281883990.

Adding to 451620505 its reverse (505026154), we get a palindrome (956646659).

The spelling of 451620505 in words is "four hundred fifty-one million, six hundred twenty thousand, five hundred five".