71481904321 has 9 divisors (see below), whose sum is σ = 73279126249. Its totient is φ = 69727748800.

The previous prime is 71481904303. The next prime is 71481904331. The reversal of 71481904321 is 12340918417.

The square root of 71481904321 is 267361.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 192904321 + 71289000000 = 13889^2 + 267000^2 .

It is not a de Polignac number, because 71481904321 - 2⁵ = 71481904289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71481904331) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10958541 + ... + 10965061.

Almost surely, 2^71481904321 is an apocalyptic number.

71481904321 is the 267361-st square number.

71481904321 is the 133681-st centered octagonal number.

It is an amenable number.

71481904321 is a deficient number, since it is larger than the sum of its proper divisors (1797221928).

71481904321 is an frugal number, since it uses more digits than its factorization.

71481904321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13124 (or 6562 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 71481904321 in words is "seventy-one billion, four hundred eighty-one million, nine hundred four thousand, three hundred twenty-one".