991301000779 has 2 divisors, whose sum is σ = 991301000780. Its totient is φ = 991301000778.

The previous prime is 991301000761. The next prime is 991301000849. The reversal of 991301000779 is 977000103199.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 991301000779 - 2¹¹ = 991300998731 is a prime.

It is not a weakly prime, because it can be changed into another prime (991301000759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495650500389 + 495650500390.

It is an arithmetic number, because the mean of its divisors is an integer number (495650500390).

Almost surely, 2^991301000779 is an apocalyptic number.

991301000779 is a deficient number, since it is larger than the sum of its proper divisors (1).

991301000779 is an equidigital number, since it uses as much as digits as its factorization.

991301000779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107163, while the sum is 46.

The spelling of 991301000779 in words is "nine hundred ninety-one billion, three hundred one million, seven hundred seventy-nine", and thus it is an aban number.