2721761993 has 2 divisors, whose sum is σ = 2721761994. Its totient is φ = 2721761992.

The previous prime is 2721761953. The next prime is 2721762031. The reversal of 2721761993 is 3991671272.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2694440464 + 27321529 = 51908^2 + 5227^2 .

It is a cyclic number.

It is not a de Polignac number, because 2721761993 - 2⁶ = 2721761929 is a prime.

It is not a weakly prime, because it can be changed into another prime (2721761953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1360880996 + 1360880997.

It is an arithmetic number, because the mean of its divisors is an integer number (1360880997).

Almost surely, 2^2721761993 is an apocalyptic number.

It is an amenable number.

2721761993 is a deficient number, since it is larger than the sum of its proper divisors (1).

2721761993 is an equidigital number, since it uses as much as digits as its factorization.

2721761993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 47.

The square root of 2721761993 is about 52170.5088435986. The cubic root of 2721761993 is about 1396.2077631091.

The spelling of 2721761993 in words is "two billion, seven hundred twenty-one million, seven hundred sixty-one thousand, nine hundred ninety-three".