4971455721 has 12 divisors (see below), whose sum is σ = 7248105072. Its totient is φ = 3283328376.

The previous prime is 4971455683. The next prime is 4971455729. The reversal of 4971455721 is 1275541794.

4971455721 is a `hidden beast` number, since 4 + 9 + 71 + 4 + 5 + 572 + 1 = 666.

It is not a de Polignac number, because 4971455721 - 2¹⁴ = 4971439337 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (4971455729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2580271 + ... + 2582196.

It is an arithmetic number, because the mean of its divisors is an integer number (604008756).

Almost surely, 2^4971455721 is an apocalyptic number.

It is an amenable number.

4971455721 is a deficient number, since it is larger than the sum of its proper divisors (2276649351).

4971455721 is a wasteful number, since it uses less digits than its factorization.

4971455721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5162580 (or 5162577 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 4971455721 is about 70508.5506942243. The cubic root of 4971455721 is about 1706.7157327194.

The spelling of 4971455721 in words is "four billion, nine hundred seventy-one million, four hundred fifty-five thousand, seven hundred twenty-one".