425891 has 4 divisors (see below), whose sum is σ = 444432. Its totient is φ = 407352.

The previous prime is 425879. The next prime is 425899. The reversal of 425891 is 198524.

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 425891 - 2¹⁰ = 424867 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 425891.

It is not an unprimeable number, because it can be changed into a prime (425899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9236 + ... + 9281.

It is an arithmetic number, because the mean of its divisors is an integer number (111108).

2⁴²⁵⁸⁹¹ is an apocalyptic number.

425891 is a deficient number, since it is larger than the sum of its proper divisors (18541).

425891 is a wasteful number, since it uses less digits than its factorization.

425891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18540.

The product of its digits is 2880, while the sum is 29.

The square root of 425891 is about 652.6032485362. The cubic root of 425891 is about 75.2372339944.

The spelling of 425891 in words is "four hundred twenty-five thousand, eight hundred ninety-one".