1721518963 has 2 divisors, whose sum is σ = 1721518964. Its totient is φ = 1721518962.

The previous prime is 1721518913. The next prime is 1721518993. The reversal of 1721518963 is 3698151271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1721518963 - 2⁹ = 1721518451 is a prime.

It is not a weakly prime, because it can be changed into another prime (1721518913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860759481 + 860759482.

It is an arithmetic number, because the mean of its divisors is an integer number (860759482).

Almost surely, 2^1721518963 is an apocalyptic number.

1721518963 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721518963 is an equidigital number, since it uses as much as digits as its factorization.

1721518963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 43.

The square root of 1721518963 is about 41491.1913904626. The cubic root of 1721518963 is about 1198.4978804356.

The spelling of 1721518963 in words is "one billion, seven hundred twenty-one million, five hundred eighteen thousand, nine hundred sixty-three".