970817021 has 4 divisors (see below), whose sum is σ = 1004293500. Its totient is φ = 937340544.

The previous prime is 970816997. The next prime is 970817039. The reversal of 970817021 is 120718079.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 196308121 + 774508900 = 14011^2 + 27830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-970817021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (970817921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16738196 + ... + 16738253.

It is an arithmetic number, because the mean of its divisors is an integer number (251073375).

Almost surely, 2^970817021 is an apocalyptic number.

It is an amenable number.

970817021 is a deficient number, since it is larger than the sum of its proper divisors (33476479).

970817021 is a wasteful number, since it uses less digits than its factorization.

970817021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33476478.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 970817021 is about 31157.9367256563. The cubic root of 970817021 is about 990.1761482980.

The spelling of 970817021 in words is "nine hundred seventy million, eight hundred seventeen thousand, twenty-one".