2691944989 has 2 divisors, whose sum is σ = 2691944990. Its totient is φ = 2691944988.

The previous prime is 2691944933. The next prime is 2691944993. The reversal of 2691944989 is 9894491962.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2534316964 + 157628025 = 50342^2 + 12555^2 .

It is a cyclic number.

It is not a de Polignac number, because 2691944989 - 2⁹ = 2691944477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2691944789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1345972494 + 1345972495.

It is an arithmetic number, because the mean of its divisors is an integer number (1345972495).

Almost surely, 2^2691944989 is an apocalyptic number.

It is an amenable number.

2691944989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2691944989 is an equidigital number, since it uses as much as digits as its factorization.

2691944989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10077696, while the sum is 61.

The square root of 2691944989 is about 51883.9569520290. The cubic root of 2691944989 is about 1391.0905281858.

The spelling of 2691944989 in words is "two billion, six hundred ninety-one million, nine hundred forty-four thousand, nine hundred eighty-nine".