1721367563 has 4 divisors (see below), whose sum is σ = 1721472480. Its totient is φ = 1721262648.

The previous prime is 1721367553. The next prime is 1721367611. The reversal of 1721367563 is 3657631271.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1721367563 - 2⁴ = 1721367547 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1721367563.

It is not an unprimeable number, because it can be changed into a prime (1721367553) 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 in 3 ways as a sum of consecutive naturals, for example, 21923 + ... + 62636.

It is an arithmetic number, because the mean of its divisors is an integer number (430368120).

Almost surely, 2^1721367563 is an apocalyptic number.

1721367563 is a deficient number, since it is larger than the sum of its proper divisors (104917).

1721367563 is an equidigital number, since it uses as much as digits as its factorization.

1721367563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104916.

The product of its digits is 158760, while the sum is 41.

The square root of 1721367563 is about 41489.3668667045. The cubic root of 1721367563 is about 1198.4627452047.

The spelling of 1721367563 in words is "one billion, seven hundred twenty-one million, three hundred sixty-seven thousand, five hundred sixty-three".