421564501 has 8 divisors (see below), whose sum is σ = 432321624. Its totient is φ = 410830080.

The previous prime is 421564439. The next prime is 421564529. The reversal of 421564501 is 105465124.

It can be written as a sum of positive squares in 4 ways, for example, as 29484900 + 392079601 = 5430^2 + 19801^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421564501 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 421564501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421564301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35721 + ... + 46033.

It is an arithmetic number, because the mean of its divisors is an integer number (54040203).

Almost surely, 2^421564501 is an apocalyptic number.

421564501 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

421564501 is a deficient number, since it is larger than the sum of its proper divisors (10757123).

421564501 is a wasteful number, since it uses less digits than its factorization.

421564501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11351.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 421564501 is about 20532.0359682132. The cubic root of 421564501 is about 749.8159554331.

The spelling of 421564501 in words is "four hundred twenty-one million, five hundred sixty-four thousand, five hundred one".