420198091 has 4 divisors (see below), whose sum is σ = 442313800. Its totient is φ = 398082384.

The previous prime is 420198049. The next prime is 420198113. The reversal of 420198091 is 190891024.

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

It is a cyclic number.

It is not a de Polignac number, because 420198091 - 2¹⁵ = 420165323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420198391) 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, 11057826 + ... + 11057863.

It is an arithmetic number, because the mean of its divisors is an integer number (110578450).

Almost surely, 2^420198091 is an apocalyptic number.

420198091 is a deficient number, since it is larger than the sum of its proper divisors (22115709).

420198091 is a wasteful number, since it uses less digits than its factorization.

420198091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22115708.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 420198091 is about 20498.7338877307. The cubic root of 420198091 is about 749.0049565834.

The spelling of 420198091 in words is "four hundred twenty million, one hundred ninety-eight thousand, ninety-one".