969665821 has 8 divisors (see below), whose sum is σ = 988329600. Its totient is φ = 951091440.

The previous prime is 969665819. The next prime is 969665831. The reversal of 969665821 is 128566969.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 969665821 - 2¹ = 969665819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (969665831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241 + ... + 44038.

It is an arithmetic number, because the mean of its divisors is an integer number (123541200).

Almost surely, 2^969665821 is an apocalyptic number.

It is an amenable number.

969665821 is a deficient number, since it is larger than the sum of its proper divisors (18663779).

969665821 is a wasteful number, since it uses less digits than its factorization.

969665821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44699.

The product of its digits is 1399680, while the sum is 52.

The square root of 969665821 is about 31139.4576221231. The cubic root of 969665821 is about 989.7846081083.

The spelling of 969665821 in words is "nine hundred sixty-nine million, six hundred sixty-five thousand, eight hundred twenty-one".