8491642741 has 4 divisors (see below), whose sum is σ = 8496660172. Its totient is φ = 8486625312.

The previous prime is 8491642739. The next prime is 8491642751. The reversal of 8491642741 is 1472461948.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4013222500 + 4478420241 = 63350^2 + 66921^2 .

It is a cyclic number.

It is not a de Polignac number, because 8491642741 - 2¹ = 8491642739 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8491642691 and 8491642700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8491642751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2506176 + ... + 2509561.

It is an arithmetic number, because the mean of its divisors is an integer number (2124165043).

Almost surely, 2^8491642741 is an apocalyptic number.

It is an amenable number.

8491642741 is a deficient number, since it is larger than the sum of its proper divisors (5017431).

8491642741 is a wasteful number, since it uses less digits than its factorization.

8491642741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5017430.

The product of its digits is 387072, while the sum is 46.

The square root of 8491642741 is about 92150.1098263046. The cubic root of 8491642741 is about 2040.1584796943.

The spelling of 8491642741 in words is "eight billion, four hundred ninety-one million, six hundred forty-two thousand, seven hundred forty-one".