991274617747 has 2 divisors, whose sum is σ = 991274617748. Its totient is φ = 991274617746.

The previous prime is 991274617721. The next prime is 991274617789. The reversal of 991274617747 is 747716472199.

991274617747 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 991274617747 - 2¹¹ = 991274615699 is a prime.

It is not a weakly prime, because it can be changed into another prime (991274617547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495637308873 + 495637308874.

It is an arithmetic number, because the mean of its divisors is an integer number (495637308874).

Almost surely, 2^991274617747 is an apocalyptic number.

991274617747 is a deficient number, since it is larger than the sum of its proper divisors (1).

991274617747 is an equidigital number, since it uses as much as digits as its factorization.

991274617747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37340352, while the sum is 64.

The spelling of 991274617747 in words is "nine hundred ninety-one billion, two hundred seventy-four million, six hundred seventeen thousand, seven hundred forty-seven".