420837553 has 2 divisors, whose sum is σ = 420837554. Its totient is φ = 420837552.

The previous prime is 420837541. The next prime is 420837587. The reversal of 420837553 is 355738024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 414041104 + 6796449 = 20348^2 + 2607^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420837553 is a prime.

It is not a weakly prime, because it can be changed into another prime (420837523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210418776 + 210418777.

It is an arithmetic number, because the mean of its divisors is an integer number (210418777).

Almost surely, 2^420837553 is an apocalyptic number.

It is an amenable number.

420837553 is a deficient number, since it is larger than the sum of its proper divisors (1).

420837553 is an equidigital number, since it uses as much as digits as its factorization.

420837553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 37.

The square root of 420837553 is about 20514.3255555721. The cubic root of 420837553 is about 749.3847119581.

The spelling of 420837553 in words is "four hundred twenty million, eight hundred thirty-seven thousand, five hundred fifty-three".