2091756481 has 2 divisors, whose sum is σ = 2091756482. Its totient is φ = 2091756480.

The previous prime is 2091756463. The next prime is 2091756529. The reversal of 2091756481 is 1846571902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1096669456 + 995087025 = 33116^2 + 31545^2 .

It is a cyclic number.

It is not a de Polignac number, because 2091756481 - 2²³ = 2083367873 is a prime.

It is a super-2 number, since 2×2091756481² = 8750890351611006722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2091756431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1045878240 + 1045878241.

It is an arithmetic number, because the mean of its divisors is an integer number (1045878241).

Almost surely, 2^2091756481 is an apocalyptic number.

It is an amenable number.

2091756481 is a deficient number, since it is larger than the sum of its proper divisors (1).

2091756481 is an equidigital number, since it uses as much as digits as its factorization.

2091756481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 2091756481 is about 45735.7243410444. The cubic root of 2091756481 is about 1278.9013361016.

The spelling of 2091756481 in words is "two billion, ninety-one million, seven hundred fifty-six thousand, four hundred eighty-one".