420451117 has 2 divisors, whose sum is σ = 420451118. Its totient is φ = 420451116.

The previous prime is 420451111. The next prime is 420451147. The reversal of 420451117 is 711154024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 394379881 + 26071236 = 19859^2 + 5106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420451117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 420451091 and 420451100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420451111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210225558 + 210225559.

It is an arithmetic number, because the mean of its divisors is an integer number (210225559).

Almost surely, 2^420451117 is an apocalyptic number.

It is an amenable number.

420451117 is a deficient number, since it is larger than the sum of its proper divisors (1).

420451117 is an equidigital number, since it uses as much as digits as its factorization.

420451117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 420451117 is about 20504.9047059478. The cubic root of 420451117 is about 749.1552664056.

The spelling of 420451117 in words is "four hundred twenty million, four hundred fifty-one thousand, one hundred seventeen".