420109581 has 16 divisors (see below), whose sum is σ = 577854144. Its totient is φ = 271286784.

The previous prime is 420109579. The next prime is 420109603. The reversal of 420109581 is 185901024.

It is a happy number.

It is not a de Polignac number, because 420109581 - 2¹ = 420109579 is a prime.

It is a super-2 number, since 2×420109581² = 352984120095991122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420109511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16861 + ... + 33533.

It is an arithmetic number, because the mean of its divisors is an integer number (36115884).

Almost surely, 2^420109581 is an apocalyptic number.

It is an amenable number.

420109581 is a deficient number, since it is larger than the sum of its proper divisors (157744563).

420109581 is a wasteful number, since it uses less digits than its factorization.

420109581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16940.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 420109581 is about 20496.5748602053. The cubic root of 420109581 is about 748.9523630683.

The spelling of 420109581 in words is "four hundred twenty million, one hundred nine thousand, five hundred eighty-one".