451420861 has 2 divisors, whose sum is σ = 451420862. Its totient is φ = 451420860.

The previous prime is 451420847. The next prime is 451420877. The reversal of 451420861 is 168024154.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 316163961 + 135256900 = 17781^2 + 11630^2 .

It is a cyclic number.

It is not a de Polignac number, because 451420861 - 2⁷ = 451420733 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (451420811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225710430 + 225710431.

It is an arithmetic number, because the mean of its divisors is an integer number (225710431).

Almost surely, 2^451420861 is an apocalyptic number.

It is an amenable number.

451420861 is a deficient number, since it is larger than the sum of its proper divisors (1).

451420861 is an equidigital number, since it uses as much as digits as its factorization.

451420861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 451420861 is about 21246.6670562703. The cubic root of 451420861 is about 767.1151177428.

The spelling of 451420861 in words is "four hundred fifty-one million, four hundred twenty thousand, eight hundred sixty-one".