9973217956 has 81 divisors (see below), whose sum is σ = 19875382401. Its totient is φ = 4376527584.

The previous prime is 9973217953. The next prime is 9973217959. The reversal of 9973217956 is 6597123799.

The square root of 9973217956 is 99866.

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

It is an interprime number because it is at equal distance from previous prime (9973217953) and next prime (9973217959).

It can be written as a sum of positive squares in only one way, i.e., 1475328100 + 8497889856 = 38410^2 + 92184^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9973217956.

It is not an unprimeable number, because it can be changed into a prime (9973217953) 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, 59719785 + ... + 59719951.

Almost surely, 2^9973217956 is an apocalyptic number.

9973217956 is the 99866-th square number.

It is an amenable number.

9973217956 is a deficient number, since it is larger than the sum of its proper divisors (9902164445).

9973217956 is a wasteful number, since it uses less digits than its factorization.

9973217956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410 (or 205 counting only the distinct ones).

The product of its digits is 6429780, while the sum is 58.

The cubic root of 9973217956 is about 2152.5096316189.

The spelling of 9973217956 in words is "nine billion, nine hundred seventy-three million, two hundred seventeen thousand, nine hundred fifty-six".