491016557 has 6 divisors (see below), whose sum is σ = 492269418. Its totient is φ = 489766064.

The previous prime is 491016541. The next prime is 491016569. The reversal of 491016557 is 755610194.

It can be written as a sum of positive squares in 3 ways, for example, as 6180196 + 484836361 = 2486^2 + 22019^2 .

It is not a de Polignac number, because 491016557 - 2⁴ = 491016541 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 491016557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491016577) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 615683 + ... + 616479.

It is an arithmetic number, because the mean of its divisors is an integer number (82044903).

Almost surely, 2^491016557 is an apocalyptic number.

It is an amenable number.

491016557 is a deficient number, since it is larger than the sum of its proper divisors (1252861).

491016557 is an frugal number, since it uses more digits than its factorization.

491016557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2367 (or 1570 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 491016557 is about 22158.8934064858. The cubic root of 491016557 is about 788.9183279021.

The spelling of 491016557 in words is "four hundred ninety-one million, sixteen thousand, five hundred fifty-seven".