912291979561 has 2 divisors, whose sum is σ = 912291979562. Its totient is φ = 912291979560.

The previous prime is 912291979553. The next prime is 912291979591. The reversal of 912291979561 is 165979192219.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 771033267225 + 141258712336 = 878085^2 + 375844^2 .

It is an emirp because it is prime and its reverse (165979192219) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 912291979561 - 2³ = 912291979553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 912291979561.

It is not a weakly prime, because it can be changed into another prime (912291979541) 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, 456145989780 + 456145989781.

It is an arithmetic number, because the mean of its divisors is an integer number (456145989781).

Almost surely, 2^912291979561 is an apocalyptic number.

It is an amenable number.

912291979561 is a deficient number, since it is larger than the sum of its proper divisors (1).

912291979561 is an equidigital number, since it uses as much as digits as its factorization.

912291979561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5511240, while the sum is 61.

The spelling of 912291979561 in words is "nine hundred twelve billion, two hundred ninety-one million, nine hundred seventy-nine thousand, five hundred sixty-one".