451000421 has 2 divisors, whose sum is σ = 451000422. Its totient is φ = 451000420.

The previous prime is 451000379. The next prime is 451000423. The reversal of 451000421 is 124000154.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 276390625 + 174609796 = 16625^2 + 13214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-451000421 is a prime.

Together with 451000423, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 451000421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (451000423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225500210 + 225500211.

It is an arithmetic number, because the mean of its divisors is an integer number (225500211).

Almost surely, 2^451000421 is an apocalyptic number.

It is an amenable number.

451000421 is a deficient number, since it is larger than the sum of its proper divisors (1).

451000421 is an equidigital number, since it uses as much as digits as its factorization.

451000421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 451000421 is about 21236.7704936509. The cubic root of 451000421 is about 766.8768876785.

Adding to 451000421 its reverse (124000154), we get a palindrome (575000575).

The spelling of 451000421 in words is "four hundred fifty-one million, four hundred twenty-one", and thus it is an aban number.