8491642739 has 2 divisors, whose sum is σ = 8491642740. Its totient is φ = 8491642738.

The previous prime is 8491642723. The next prime is 8491642751. The reversal of 8491642739 is 9372461948.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8491642739 - 2⁴ = 8491642723 is a prime.

It is a super-2 number, since 2×8491642739² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (8491642639) 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 as a sum of consecutive naturals, namely, 4245821369 + 4245821370.

It is an arithmetic number, because the mean of its divisors is an integer number (4245821370).

Almost surely, 2^8491642739 is an apocalyptic number.

8491642739 is a deficient number, since it is larger than the sum of its proper divisors (1).

8491642739 is an equidigital number, since it uses as much as digits as its factorization.

8491642739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 53.

The square root of 8491642739 is about 92150.1098154527. The cubic root of 8491642739 is about 2040.1584795341.

The spelling of 8491642739 in words is "eight billion, four hundred ninety-one million, six hundred forty-two thousand, seven hundred thirty-nine".