421189581 has 4 divisors (see below), whose sum is σ = 561586112. Its totient is φ = 280793052.

The previous prime is 421189579. The next prime is 421189621. The reversal of 421189581 is 185981124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 421189581 - 2¹ = 421189579 is a prime.

It is a super-2 number, since 2×421189581² = 354801326285911122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421184581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70198261 + ... + 70198266.

It is an arithmetic number, because the mean of its divisors is an integer number (140396528).

Almost surely, 2^421189581 is an apocalyptic number.

It is an amenable number.

421189581 is a deficient number, since it is larger than the sum of its proper divisors (140396531).

421189581 is a wasteful number, since it uses less digits than its factorization.

421189581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140396530.

The product of its digits is 23040, while the sum is 39.

The square root of 421189581 is about 20522.9038150063. The cubic root of 421189581 is about 749.5936056090.

The spelling of 421189581 in words is "four hundred twenty-one million, one hundred eighty-nine thousand, five hundred eighty-one".