297447315648921 has 27 divisors (see below), whose sum is σ = 453450730538559. Its totient is φ = 187860841635312.

The previous prime is 297447315648913. The next prime is 297447315648949. The reversal of 297447315648921 is 129846513744792.

The square root of 297447315648921 is 17246661.

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

297447315648921 is a `hidden beast` number, since 2 + 9 + 7 + 4 + 4 + 7 + 31 + 564 + 8 + 9 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 284366333817225 + 13080981831696 = 16863165^2 + 3616764^2 .

It is not a de Polignac number, because 297447315648921 - 2³ = 297447315648913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 297447315648921.

It is not an unprimeable number, because it can be changed into a prime (297447315648961) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 982908391 + ... + 983210963.

Almost surely, 2^{297447315648921} is an apocalyptic number.

297447315648921 is the 17246661-st square number.

297447315648921 is the 8623331-st centered octagonal number.

It is an amenable number.

297447315648921 is a deficient number, since it is larger than the sum of its proper divisors (156003414889638).

297447315648921 is an frugal number, since it uses more digits than its factorization.

297447315648921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605190 (or 302595 counting only the distinct ones).

The product of its digits is 731566080, while the sum is 72.

The spelling of 297447315648921 in words is "two hundred ninety-seven trillion, four hundred forty-seven billion, three hundred fifteen million, six hundred forty-eight thousand, nine hundred twenty-one".