451626421 has 2 divisors, whose sum is σ = 451626422. Its totient is φ = 451626420.

The previous prime is 451626419. The next prime is 451626433. The reversal of 451626421 is 124626154.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 434931025 + 16695396 = 20855^2 + 4086^2 .

It is a cyclic number.

It is not a de Polignac number, because 451626421 - 2¹ = 451626419 is a prime.

Together with 451626419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (451626491) 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 as a sum of consecutive naturals, namely, 225813210 + 225813211.

It is an arithmetic number, because the mean of its divisors is an integer number (225813211).

Almost surely, 2^451626421 is an apocalyptic number.

It is an amenable number.

451626421 is a deficient number, since it is larger than the sum of its proper divisors (1).

451626421 is an equidigital number, since it uses as much as digits as its factorization.

451626421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 31.

The square root of 451626421 is about 21251.5039703076. The cubic root of 451626421 is about 767.2315384847.

The spelling of 451626421 in words is "four hundred fifty-one million, six hundred twenty-six thousand, four hundred twenty-one".