1721940611 has 2 divisors, whose sum is σ = 1721940612. Its totient is φ = 1721940610.

The previous prime is 1721940587. The next prime is 1721940629. The reversal of 1721940611 is 1160491271.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1160491271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1721940611 - 2¹⁴ = 1721924227 is a prime.

It is a super-2 number, since 2×1721940611² = 5930158935622106642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1721940631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860970305 + 860970306.

It is an arithmetic number, because the mean of its divisors is an integer number (860970306).

Almost surely, 2^1721940611 is an apocalyptic number.

1721940611 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721940611 is an equidigital number, since it uses as much as digits as its factorization.

1721940611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 1721940611 is about 41496.2722542640. The cubic root of 1721940611 is about 1198.5957209654.

The spelling of 1721940611 in words is "one billion, seven hundred twenty-one million, nine hundred forty thousand, six hundred eleven".