2991923117 has 2 divisors, whose sum is σ = 2991923118. Its totient is φ = 2991923116.

The previous prime is 2991923107. The next prime is 2991923167. The reversal of 2991923117 is 7113291992.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2520642436 + 471280681 = 50206^2 + 21709^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2991923117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2991923107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1495961558 + 1495961559.

It is an arithmetic number, because the mean of its divisors is an integer number (1495961559).

Almost surely, 2^2991923117 is an apocalyptic number.

It is an amenable number.

2991923117 is a deficient number, since it is larger than the sum of its proper divisors (1).

2991923117 is an equidigital number, since it uses as much as digits as its factorization.

2991923117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 44.

The square root of 2991923117 is about 54698.4745399723. The cubic root of 2991923117 is about 1440.9540868882.

The spelling of 2991923117 in words is "two billion, nine hundred ninety-one million, nine hundred twenty-three thousand, one hundred seventeen".