421312561 has 8 divisors (see below), whose sum is σ = 426535200. Its totient is φ = 416100960.

The previous prime is 421312553. The next prime is 421312583. The reversal of 421312561 is 165213124.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 421312561 - 2³ = 421312553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421312501) 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 7 ways as a sum of consecutive naturals, for example, 94930 + ... + 99268.

It is an arithmetic number, because the mean of its divisors is an integer number (53316900).

Almost surely, 2^421312561 is an apocalyptic number.

It is an amenable number.

421312561 is a deficient number, since it is larger than the sum of its proper divisors (5222639).

421312561 is a wasteful number, since it uses less digits than its factorization.

421312561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5519.

The product of its digits is 1440, while the sum is 25.

The square root of 421312561 is about 20525.8997610336. The cubic root of 421312561 is about 749.6665545890. Note that the first 3 decimals are identical.

Adding to 421312561 its reverse (165213124), we get a palindrome (586525685).

The spelling of 421312561 in words is "four hundred twenty-one million, three hundred twelve thousand, five hundred sixty-one".