420057251 has 2 divisors, whose sum is σ = 420057252. Its totient is φ = 420057250.

The previous prime is 420057247. The next prime is 420057311. The reversal of 420057251 is 152750024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420057251 - 2² = 420057247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420057251.

It is not a weakly prime, because it can be changed into another prime (420057241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210028625 + 210028626.

It is an arithmetic number, because the mean of its divisors is an integer number (210028626).

Almost surely, 2^420057251 is an apocalyptic number.

420057251 is a deficient number, since it is larger than the sum of its proper divisors (1).

420057251 is an equidigital number, since it uses as much as digits as its factorization.

420057251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 420057251 is about 20495.2982656999. The cubic root of 420057251 is about 748.9212645912.

The spelling of 420057251 in words is "four hundred twenty million, fifty-seven thousand, two hundred fifty-one".