491553405 has 48 divisors (see below), whose sum is σ = 986119680. Its totient is φ = 221854464.

The previous prime is 491553379. The next prime is 491553421. The reversal of 491553405 is 504355194.

It is not a de Polignac number, because 491553405 - 2¹⁰ = 491552381 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491553405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15009 + ... + 34761.

It is an arithmetic number, because the mean of its divisors is an integer number (20544160).

Almost surely, 2^491553405 is an apocalyptic number.

491553405 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

491553405 is an abundant number, since it is smaller than the sum of its proper divisors (494566275).

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

491553405 is a wasteful number, since it uses less digits than its factorization.

491553405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19850 (or 19847 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 491553405 is about 22171.0036985248. The cubic root of 491553405 is about 789.2057418127.

The spelling of 491553405 in words is "four hundred ninety-one million, five hundred fifty-three thousand, four hundred five".