451669221 has 12 divisors (see below), whose sum is σ = 652631148. Its totient is φ = 301011264.

The previous prime is 451669217. The next prime is 451669247. The reversal of 451669221 is 122966154.

It can be written as a sum of positive squares in 2 ways, for example, as 263705121 + 187964100 = 16239^2 + 13710^2 .

It is not a de Polignac number, because 451669221 - 2² = 451669217 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451669271) 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 in 11 ways as a sum of consecutive naturals, for example, 27951 + ... + 41043.

It is an arithmetic number, because the mean of its divisors is an integer number (54385929).

Almost surely, 2^451669221 is an apocalyptic number.

It is an amenable number.

451669221 is a deficient number, since it is larger than the sum of its proper divisors (200961927).

451669221 is a wasteful number, since it uses less digits than its factorization.

451669221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16932 (or 16929 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 451669221 is about 21252.5109340050. The cubic root of 451669221 is about 767.2557742033.

It can be divided in two parts, 4516 and 69221, that added together give a palindrome (73737).

The spelling of 451669221 in words is "four hundred fifty-one million, six hundred sixty-nine thousand, two hundred twenty-one".