247097473921 has 27 divisors (see below), whose sum is σ = 261105130299. Its totient is φ = 233830665600.

The previous prime is 247097473873. The next prime is 247097473999. The reversal of 247097473921 is 129374790742.

The square root of 247097473921 is 497089.

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

It can be written as a sum of positive squares in 13 ways, for example, as 212188288321 + 34909185600 = 460639^2 + 186840^2 .

It is not a de Polignac number, because 247097473921 - 2⁷ = 247097473793 is a prime.

It is a super-2 number, since 2×247097473921² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247097473321) 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, 879350301 + ... + 879350581.

Almost surely, 2^247097473921 is an apocalyptic number.

247097473921 is the 497089-th square number.

247097473921 is the 248545-th centered octagonal number.

It is an amenable number.

247097473921 is a deficient number, since it is larger than the sum of its proper divisors (14007656378).

247097473921 is an frugal number, since it uses more digits than its factorization.

247097473921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 5334336, while the sum is 55.

The spelling of 247097473921 in words is "two hundred forty-seven billion, ninety-seven million, four hundred seventy-three thousand, nine hundred twenty-one".