420831191 has 4 divisors (see below), whose sum is σ = 459088584. Its totient is φ = 382573800.

The previous prime is 420831181. The next prime is 420831199. The reversal of 420831191 is 191138024.

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 420831191 - 2¹⁰ = 420830167 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 (420831199) 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, 19128680 + ... + 19128701.

It is an arithmetic number, because the mean of its divisors is an integer number (114772146).

Almost surely, 2^420831191 is an apocalyptic number.

420831191 is a deficient number, since it is larger than the sum of its proper divisors (38257393).

420831191 is a wasteful number, since it uses less digits than its factorization.

420831191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38257392.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 420831191 is about 20514.1704926131. The cubic root of 420831191 is about 749.3809356716.

The spelling of 420831191 in words is "four hundred twenty million, eight hundred thirty-one thousand, one hundred ninety-one".