4961312721 has 32 divisors (see below), whose sum is σ = 7809091200. Its totient is φ = 3107160000.

The previous prime is 4961312693. The next prime is 4961312723. The reversal of 4961312721 is 1272131694.

4961312721 is a `hidden beast` number, since 4 + 9 + 613 + 12 + 7 + 21 = 666.

It is not a de Polignac number, because 4961312721 - 2¹⁷ = 4961181649 is a prime.

It is a super-2 number, since 2×4961312721² = 49229247831112847682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4961312723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56655 + ... + 114596.

It is an arithmetic number, because the mean of its divisors is an integer number (244034100).

Almost surely, 2^4961312721 is an apocalyptic number.

It is an amenable number.

4961312721 is a deficient number, since it is larger than the sum of its proper divisors (2847778479).

4961312721 is a wasteful number, since it uses less digits than its factorization.

4961312721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171326 (or 171320 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 4961312721 is about 70436.5865229144. The cubic root of 4961312721 is about 1705.5542349564.

The spelling of 4961312721 in words is "four billion, nine hundred sixty-one million, three hundred twelve thousand, seven hundred twenty-one".