491825385 has 96 divisors (see below), whose sum is σ = 960906240. Its totient is φ = 237841920.

The previous prime is 491825339. The next prime is 491825387. The reversal of 491825385 is 583528194.

491825385 is a `hidden beast` number, since 491 + 82 + 5 + 3 + 85 = 666.

491825385 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 491825385 - 2⁸ = 491825129 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 491825385.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491825387) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2205384 + ... + 2205606.

It is an arithmetic number, because the mean of its divisors is an integer number (10009440).

Almost surely, 2^491825385 is an apocalyptic number.

491825385 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

491825385 is a deficient number, since it is larger than the sum of its proper divisors (469080855).

491825385 is a wasteful number, since it uses less digits than its factorization.

491825385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316 (or 279 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 491825385 is about 22177.1365374342. The cubic root of 491825385 is about 789.3512726942.

It can be divided in two parts, 4918 and 25385, that added together give a palindrome (30303).

The spelling of 491825385 in words is "four hundred ninety-one million, eight hundred twenty-five thousand, three hundred eighty-five".