420003251 has 2 divisors, whose sum is σ = 420003252. Its totient is φ = 420003250.

The previous prime is 420003223. The next prime is 420003257. The reversal of 420003251 is 152300024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420003251 - 2⁶ = 420003187 is a prime.

It is not a weakly prime, because it can be changed into another prime (420003257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210001625 + 210001626.

It is an arithmetic number, because the mean of its divisors is an integer number (210001626).

Almost surely, 2^420003251 is an apocalyptic number.

420003251 is a deficient number, since it is larger than the sum of its proper divisors (1).

420003251 is an equidigital number, since it uses as much as digits as its factorization.

420003251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 420003251 is about 20493.9808480441. The cubic root of 420003251 is about 748.8891709648.

Adding to 420003251 its reverse (152300024), we get a palindrome (572303275).

The spelling of 420003251 in words is "four hundred twenty million, three thousand, two hundred fifty-one".