1721503081 has 3 divisors (see below), whose sum is σ = 1721544573. Its totient is φ = 1721461590.

The previous prime is 1721503061. The next prime is 1721503087. The reversal of 1721503081 is 1803051271.

The square root of 1721503081 is 41491.

It is a perfect power (a square), and thus also a powerful 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 not a de Polignac number, because 1721503081 - 2⁷ = 1721502953 is a prime.

It is a super-3 number, since 3×1721503081³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1721503087) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 20746 + ... + 62236.

It is an arithmetic number, because the mean of its divisors is an integer number (573848191).

Almost surely, 2^1721503081 is an apocalyptic number.

1721503081 is the 41491-st square number.

1721503081 is the 20746-th centered octagonal number.

It is an amenable number.

1721503081 is a deficient number, since it is larger than the sum of its proper divisors (41492).

1721503081 is an frugal number, since it uses more digits than its factorization.

1721503081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82982 (or 41491 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 28.

The cubic root of 1721503081 is about 1198.4941948141.

The spelling of 1721503081 in words is "one billion, seven hundred twenty-one million, five hundred three thousand, eighty-one".