491261547 has 16 divisors (see below), whose sum is σ = 748912640. Its totient is φ = 280599552.

The previous prime is 491261521. The next prime is 491261569. The reversal of 491261547 is 745162194.

It is not a de Polignac number, because 491261547 - 2¹⁸ = 490999403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (491261047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71979 + ... + 78507.

It is an arithmetic number, because the mean of its divisors is an integer number (46807040).

Almost surely, 2^491261547 is an apocalyptic number.

491261547 is a deficient number, since it is larger than the sum of its proper divisors (257651093).

491261547 is a wasteful number, since it uses less digits than its factorization.

491261547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10122.

The product of its digits is 60480, while the sum is 39.

The square root of 491261547 is about 22164.4207458711. The cubic root of 491261547 is about 789.0495149008.

The spelling of 491261547 in words is "four hundred ninety-one million, two hundred sixty-one thousand, five hundred forty-seven".