971821745 has 24 divisors (see below), whose sum is σ = 1259928000. Its totient is φ = 719259392.

The previous prime is 971821703. The next prime is 971821751. The reversal of 971821745 is 547128179.

It is not a de Polignac number, because 971821745 - 2⁶ = 971821681 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 971821696 and 971821705.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 79556 + ... + 90954.

It is an arithmetic number, because the mean of its divisors is an integer number (52497000).

Almost surely, 2^971821745 is an apocalyptic number.

It is an amenable number.

971821745 is a deficient number, since it is larger than the sum of its proper divisors (288106255).

971821745 is a wasteful number, since it uses less digits than its factorization.

971821745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11497 (or 11480 counting only the distinct ones).

The product of its digits is 141120, while the sum is 44.

The square root of 971821745 is about 31174.0556392652. The cubic root of 971821745 is about 990.5176169497.

The spelling of 971821745 in words is "nine hundred seventy-one million, eight hundred twenty-one thousand, seven hundred forty-five".