420108581 has 16 divisors (see below), whose sum is σ = 440092224. Its totient is φ = 400667904.

The previous prime is 420108571. The next prime is 420108583. The reversal of 420108581 is 185801024.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420108581 is a prime.

It is a super-3 number, since 3×420108581³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420108583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 767750 + ... + 768296.

It is an arithmetic number, because the mean of its divisors is an integer number (27505764).

Almost surely, 2^420108581 is an apocalyptic number.

It is an amenable number.

420108581 is a deficient number, since it is larger than the sum of its proper divisors (19983643).

420108581 is a wasteful number, since it uses less digits than its factorization.

420108581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 420108581 is about 20496.5504658711. The cubic root of 420108581 is about 748.9517688162.

The spelling of 420108581 in words is "four hundred twenty million, one hundred eight thousand, five hundred eighty-one".