428905032191 has 4 divisors (see below), whose sum is σ = 428920519872. Its totient is φ = 428889544512.

The previous prime is 428905032161. The next prime is 428905032233. The reversal of 428905032191 is 191230509824.

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 428905032191 - 2³⁸ = 154027125247 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 (428905032161) 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, 7702226 + ... + 7757711.

It is an arithmetic number, because the mean of its divisors is an integer number (107230129968).

Almost surely, 2^428905032191 is an apocalyptic number.

428905032191 is a deficient number, since it is larger than the sum of its proper divisors (15487681).

428905032191 is a wasteful number, since it uses less digits than its factorization.

428905032191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15487680.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 428905032191 in words is "four hundred twenty-eight billion, nine hundred five million, thirty-two thousand, one hundred ninety-one".