491778055 has 8 divisors (see below), whose sum is σ = 590380992. Its totient is φ = 393257568.

The previous prime is 491778029. The next prime is 491778059. The reversal of 491778055 is 550877194.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 491778055 - 2¹¹ = 491776007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491777996 and 491778014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491778059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6624 + ... + 32053.

It is an arithmetic number, because the mean of its divisors is an integer number (73797624).

Almost surely, 2^491778055 is an apocalyptic number.

491778055 is a deficient number, since it is larger than the sum of its proper divisors (98602937).

491778055 is a wasteful number, since it uses less digits than its factorization.

491778055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41225.

The product of its (nonzero) digits is 352800, while the sum is 46.

The square root of 491778055 is about 22176.0694217889. The cubic root of 491778055 is about 789.3259512452.

The spelling of 491778055 in words is "four hundred ninety-one million, seven hundred seventy-eight thousand, fifty-five".