420911851 has 2 divisors, whose sum is σ = 420911852. Its totient is φ = 420911850.

The previous prime is 420911839. The next prime is 420911861. The reversal of 420911851 is 158119024.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420911851 - 2¹⁷ = 420780779 is a prime.

It is not a weakly prime, because it can be changed into another prime (420911801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210455925 + 210455926.

It is an arithmetic number, because the mean of its divisors is an integer number (210455926).

Almost surely, 2^420911851 is an apocalyptic number.

420911851 is a deficient number, since it is larger than the sum of its proper divisors (1).

420911851 is an equidigital number, since it uses as much as digits as its factorization.

420911851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 420911851 is about 20516.1363565365. The cubic root of 420911851 is about 749.4288101370.

The spelling of 420911851 in words is "four hundred twenty million, nine hundred eleven thousand, eight hundred fifty-one".