421566897 has 8 divisors (see below), whose sum is σ = 569789344. Its totient is φ = 277194528.

The previous prime is 421566841. The next prime is 421566907. The reversal of 421566897 is 798665124.

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

It is not a de Polignac number, because 421566897 - 2¹¹ = 421564849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421556897) 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, 962263 + ... + 962700.

It is an arithmetic number, because the mean of its divisors is an integer number (71223668).

Almost surely, 2^421566897 is an apocalyptic number.

It is an amenable number.

421566897 is a deficient number, since it is larger than the sum of its proper divisors (148222447).

421566897 is a wasteful number, since it uses less digits than its factorization.

421566897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1925039.

The product of its digits is 725760, while the sum is 48.

The square root of 421566897 is about 20532.0943159727. The cubic root of 421566897 is about 749.8173759793.

The spelling of 421566897 in words is "four hundred twenty-one million, five hundred sixty-six thousand, eight hundred ninety-seven".