968891921 has 4 divisors (see below), whose sum is σ = 968985600. Its totient is φ = 968798244.

The previous prime is 968891893. The next prime is 968891929. The reversal of 968891921 is 129198869.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 968891921 - 2¹⁸ = 968629777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (968891929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29081 + ... + 52758.

It is an arithmetic number, because the mean of its divisors is an integer number (242246400).

Almost surely, 2^968891921 is an apocalyptic number.

It is an amenable number.

968891921 is a deficient number, since it is larger than the sum of its proper divisors (93679).

968891921 is a wasteful number, since it uses less digits than its factorization.

968891921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93678.

The product of its digits is 559872, while the sum is 53.

The square root of 968891921 is about 31127.0287852856. The cubic root of 968891921 is about 989.5212190229.

The spelling of 968891921 in words is "nine hundred sixty-eight million, eight hundred ninety-one thousand, nine hundred twenty-one".