421590491 has 4 divisors (see below), whose sum is σ = 481817712. Its totient is φ = 361363272.

The previous prime is 421590479. The next prime is 421590523. The reversal of 421590491 is 194095124.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421590491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421590401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30113600 + ... + 30113613.

It is an arithmetic number, because the mean of its divisors is an integer number (120454428).

Almost surely, 2^421590491 is an apocalyptic number.

421590491 is a deficient number, since it is larger than the sum of its proper divisors (60227221).

421590491 is an equidigital number, since it uses as much as digits as its factorization.

421590491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60227220.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 421590491 is about 20532.6688718247. The cubic root of 421590491 is about 749.8313641595.

The spelling of 421590491 in words is "four hundred twenty-one million, five hundred ninety thousand, four hundred ninety-one".