1721716481 has 6 divisors (see below), whose sum is σ = 1741286982. Its totient is φ = 1702363520.

The previous prime is 1721716427. The next prime is 1721716489. The reversal of 1721716481 is 1846171271.

It can be written as a sum of positive squares in 3 ways, for example, as 150307600 + 1571408881 = 12260^2 + 39641^2 .

It is not a de Polignac number, because 1721716481 - 2¹⁸ = 1721454337 is a prime.

It is a super-2 number, since 2×1721716481² = 5928615281894046722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1721716489) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 100760 + ... + 116601.

It is an arithmetic number, because the mean of its divisors is an integer number (290214497).

Almost surely, 2^1721716481 is an apocalyptic number.

It is an amenable number.

1721716481 is a deficient number, since it is larger than the sum of its proper divisors (19570501).

1721716481 is an frugal number, since it uses more digits than its factorization.

1721716481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217539 (or 217450 counting only the distinct ones).

The product of its digits is 18816, while the sum is 38.

The square root of 1721716481 is about 41493.5715623517. The cubic root of 1721716481 is about 1198.5437151232.

The spelling of 1721716481 in words is "one billion, seven hundred twenty-one million, seven hundred sixteen thousand, four hundred eighty-one".