421564523 has 4 divisors (see below), whose sum is σ = 421627968. Its totient is φ = 421501080.

The previous prime is 421564439. The next prime is 421564529. The reversal of 421564523 is 325465124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421564523 - 2¹⁴ = 421548139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421564523.

It is not an unprimeable number, because it can be changed into a prime (421564529) 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 3 ways as a sum of consecutive naturals, for example, 20411 + ... + 35492.

It is an arithmetic number, because the mean of its divisors is an integer number (105406992).

Almost surely, 2^421564523 is an apocalyptic number.

421564523 is a deficient number, since it is larger than the sum of its proper divisors (63445).

421564523 is an equidigital number, since it uses as much as digits as its factorization.

421564523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63444.

The product of its digits is 28800, while the sum is 32.

The square root of 421564523 is about 20532.0365039613. The cubic root of 421564523 is about 749.8159684765.

The spelling of 421564523 in words is "four hundred twenty-one million, five hundred sixty-four thousand, five hundred twenty-three".