420619081 has 3 divisors (see below), whose sum is σ = 420639591. Its totient is φ = 420598572.

The previous prime is 420619061. The next prime is 420619091. The reversal of 420619081 is 180916024.

It is a happy number.

The square root of 420619081 is 20509.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 85729081 + 334890000 = 9259^2 + 18300^2 .

It is not a de Polignac number, because 420619081 - 2⁷ = 420618953 is a prime.

It is a super-2 number, since 2×420619081² = 353840822602569122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420619061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 10255 + ... + 30763.

It is an arithmetic number, because the mean of its divisors is an integer number (140213197).

Almost surely, 2^420619081 is an apocalyptic number.

420619081 is the 20509-th square number.

420619081 is the 10255-th centered octagonal number.

It is an amenable number.

420619081 is a deficient number, since it is larger than the sum of its proper divisors (20510).

420619081 is an frugal number, since it uses more digits than its factorization.

420619081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41018 (or 20509 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The cubic root of 420619081 is about 749.2550119391.

The spelling of 420619081 in words is "four hundred twenty million, six hundred nineteen thousand, eighty-one".