491252543 has 4 divisors (see below), whose sum is σ = 517107960. Its totient is φ = 465397128.

The previous prime is 491252539. The next prime is 491252557. The reversal of 491252543 is 345252194.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 491252543 - 2² = 491252539 is a prime.

It is a super-2 number, since 2×491252543² = 482658122007933698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491252533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12927680 + ... + 12927717.

It is an arithmetic number, because the mean of its divisors is an integer number (129276990).

Almost surely, 2^491252543 is an apocalyptic number.

491252543 is a deficient number, since it is larger than the sum of its proper divisors (25855417).

491252543 is a wasteful number, since it uses less digits than its factorization.

491252543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25855416.

The product of its digits is 43200, while the sum is 35.

The square root of 491252543 is about 22164.2176266161. The cubic root of 491252543 is about 789.0446942200.

The spelling of 491252543 in words is "four hundred ninety-one million, two hundred fifty-two thousand, five hundred forty-three".