421962561 has 8 divisors (see below), whose sum is σ = 625129760. Its totient is φ = 281308356.

The previous prime is 421962553. The next prime is 421962571. The reversal of 421962561 is 165269124.

421962561 is a `hidden beast` number, since 4 + 2 + 1 + 96 + 2 + 561 = 666.

It is not a de Polignac number, because 421962561 - 2³ = 421962553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421962571) 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, 7814095 + ... + 7814148.

It is an arithmetic number, because the mean of its divisors is an integer number (78141220).

Almost surely, 2^421962561 is an apocalyptic number.

It is an amenable number.

421962561 is a deficient number, since it is larger than the sum of its proper divisors (203167199).

421962561 is a wasteful number, since it uses less digits than its factorization.

421962561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15628252 (or 15628246 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 421962561 is about 20541.7273129598. The cubic root of 421962561 is about 750.0518844106.

The spelling of 421962561 in words is "four hundred twenty-one million, nine hundred sixty-two thousand, five hundred sixty-one".