802925315721 has 9 divisors (see below), whose sum is σ = 1159784894541. Its totient is φ = 535281751692.

The previous prime is 802925315711. The next prime is 802925315749. The reversal of 802925315721 is 127513529208.

The square root of 802925315721 is 896061.

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

802925315721 is a `hidden beast` number, since 8 + 0 + 2 + 92 + 531 + 5 + 7 + 21 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 802925315721 - 2⁹ = 802925315209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (802925315711) 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 8 ways as a sum of consecutive naturals, for example, 2538840 + ... + 2837526.

Almost surely, 2^802925315721 is an apocalyptic number.

802925315721 is the 896061-st square number.

802925315721 is the 448031-st centered octagonal number.

It is an amenable number.

802925315721 is a deficient number, since it is larger than the sum of its proper divisors (356859578820).

802925315721 is an frugal number, since it uses more digits than its factorization.

802925315721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597380 (or 298690 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 802925315721 in words is "eight hundred two billion, nine hundred twenty-five million, three hundred fifteen thousand, seven hundred twenty-one".