420323251 has 2 divisors, whose sum is σ = 420323252. Its totient is φ = 420323250.

The previous prime is 420323221. The next prime is 420323291. The reversal of 420323251 is 152323024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420323251 - 2¹¹ = 420321203 is a prime.

It is not a weakly prime, because it can be changed into another prime (420323201) 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, 210161625 + 210161626.

It is an arithmetic number, because the mean of its divisors is an integer number (210161626).

Almost surely, 2^420323251 is an apocalyptic number.

420323251 is a deficient number, since it is larger than the sum of its proper divisors (1).

420323251 is an equidigital number, since it uses as much as digits as its factorization.

420323251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 420323251 is about 20501.7865319098. The cubic root of 420323251 is about 749.0793152857.

Adding to 420323251 its reverse (152323024), we get a palindrome (572646275).

The spelling of 420323251 in words is "four hundred twenty million, three hundred twenty-three thousand, two hundred fifty-one".