491255550 has 96 divisors (see below), whose sum is σ = 1362412800. Its totient is φ = 130157280.

The previous prime is 491255489. The next prime is 491255587. The reversal of 491255550 is 55552194.

491255550 is a `hidden beast` number, since 49 + 12 + 55 + 550 = 666.

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, 224361 + ... + 226539.

It is an arithmetic number, because the mean of its divisors is an integer number (14191800).

Almost surely, 2^491255550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491255550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (681206400).

491255550 is an abundant number, since it is smaller than the sum of its proper divisors (871157250).

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

491255550 is a wasteful number, since it uses less digits than its factorization.

491255550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2367 (or 2356 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The square root of 491255550 is about 22164.2854610745. The cubic root of 491255550 is about 789.0463041541.

The spelling of 491255550 in words is "four hundred ninety-one million, two hundred fifty-five thousand, five hundred fifty".