420792191 has 4 divisors (see below), whose sum is σ = 420871584. Its totient is φ = 420712800.

The previous prime is 420792187. The next prime is 420792193. The reversal of 420792191 is 191297024.

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 420792191 - 2² = 420792187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420792193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31130 + ... + 42551.

It is an arithmetic number, because the mean of its divisors is an integer number (105217896).

Almost surely, 2^420792191 is an apocalyptic number.

420792191 is a deficient number, since it is larger than the sum of its proper divisors (79393).

420792191 is an equidigital number, since it uses as much as digits as its factorization.

420792191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79392.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 420792191 is about 20513.2199081470. The cubic root of 420792191 is about 749.3577856453.

The spelling of 420792191 in words is "four hundred twenty million, seven hundred ninety-two thousand, one hundred ninety-one".