2911961363809 has 45 divisors (see below), whose sum is σ = 3203031263523. Its totient is φ = 2647231708464.

The previous prime is 2911961363789. The next prime is 2911961363819. The reversal of 2911961363809 is 9083631691192.

It is a happy number.

The square root of 2911961363809 is 1706447.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1526961904209 + 1384999459600 = 1235703^2 + 1176860^2 .

It is not a de Polignac number, because 2911961363809 - 2¹¹ = 2911961361761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2911961363819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 17864793562 + ... + 17864793724.

Almost surely, 2^{2911961363809} is an apocalyptic number.

2911961363809 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

2911961363809 is the 1706447-th square number.

2911961363809 is the 853224-th centered octagonal number.

It is an amenable number.

2911961363809 is a deficient number, since it is larger than the sum of its proper divisors (291069899714).

2911961363809 is an frugal number, since it uses more digits than its factorization.

2911961363809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460 (or 211 counting only the distinct ones).

The product of its (nonzero) digits is 3779136, while the sum is 58.

The spelling of 2911961363809 in words is "two trillion, nine hundred eleven billion, nine hundred sixty-one million, three hundred sixty-three thousand, eight hundred nine".