451221630 has 16 divisors (see below), whose sum is σ = 1082931984. Its totient is φ = 120325760.

The previous prime is 451221629. The next prime is 451221677. The reversal of 451221630 is 36122154.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 451221630.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7520331 + ... + 7520390.

It is an arithmetic number, because the mean of its divisors is an integer number (67683249).

Almost surely, 2^451221630 is an apocalyptic number.

451221630 is an abundant number, since it is smaller than the sum of its proper divisors (631710354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

451221630 is a wasteful number, since it uses less digits than its factorization.

451221630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15040731.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 451221630 is about 21241.9780152414. The cubic root of 451221630 is about 767.0022477549.

Adding to 451221630 its reverse (36122154), we get a palindrome (487343784).

The spelling of 451221630 in words is "four hundred fifty-one million, two hundred twenty-one thousand, six hundred thirty".