451621 has 2 divisors, whose sum is σ = 451622. Its totient is φ = 451620.

The previous prime is 451609. The next prime is 451637. The reversal of 451621 is 126154.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 314721 + 136900 = 561^2 + 370^2 .

It is a cyclic number.

It is not a de Polignac number, because 451621 - 2⁹ = 451109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (451601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225810 + 225811.

It is an arithmetic number, because the mean of its divisors is an integer number (225811).

2⁴⁵¹⁶²¹ is an apocalyptic number.

It is an amenable number.

451621 is a deficient number, since it is larger than the sum of its proper divisors (1).

451621 is an equidigital number, since it uses as much as digits as its factorization.

451621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 19.

The square root of 451621 is about 672.0275291980. The cubic root of 451621 is about 76.7228468706.

Adding to 451621 its reverse (126154), we get a palindrome (577775).

The spelling of 451621 in words is "four hundred fifty-one thousand, six hundred twenty-one".