421989291 has 8 divisors (see below), whose sum is σ = 625169360. Its totient is φ = 281326176.

The previous prime is 421989287. The next prime is 421989301. The reversal of 421989291 is 192989124.

It is not a de Polignac number, because 421989291 - 2² = 421989287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421989241) 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, 7814590 + ... + 7814643.

It is an arithmetic number, because the mean of its divisors is an integer number (78146170).

Almost surely, 2^421989291 is an apocalyptic number.

421989291 is a deficient number, since it is larger than the sum of its proper divisors (203180069).

421989291 is a wasteful number, since it uses less digits than its factorization.

421989291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15629242 (or 15629236 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 421989291 is about 20542.3779295387. The cubic root of 421989291 is about 750.0677218848.

The spelling of 421989291 in words is "four hundred twenty-one million, nine hundred eighty-nine thousand, two hundred ninety-one".