491869536 has 96 divisors (see below), whose sum is σ = 1362977280. Its totient is φ = 155003904.

The previous prime is 491869531. The next prime is 491869541. The reversal of 491869536 is 635968194.

It is an interprime number because it is at equal distance from previous prime (491869531) and next prime (491869541).

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491869531) 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 15 ways as a sum of consecutive naturals, for example, 195261 + ... + 197763.

It is an arithmetic number, because the mean of its divisors is an integer number (14197680).

Almost surely, 2^491869536 is an apocalyptic number.

491869536 is a gapful number since it is divisible by the number (46) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491869536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (681488640).

491869536 is an abundant number, since it is smaller than the sum of its proper divisors (871107744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491869536 is a wasteful number, since it uses less digits than its factorization.

491869536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2628 (or 2620 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 51.

The square root of 491869536 is about 22178.1319321533. The cubic root of 491869536 is about 789.3748919205.

The spelling of 491869536 in words is "four hundred ninety-one million, eight hundred sixty-nine thousand, five hundred thirty-six".