969781121 has 4 divisors (see below), whose sum is σ = 988078932. Its totient is φ = 951483312.

The previous prime is 969781117. The next prime is 969781123. The reversal of 969781121 is 121187969.

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 715027600 + 254753521 = 26740^2 + 15961^2 .

It is a cyclic number.

It is not a de Polignac number, because 969781121 - 2² = 969781117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (969781123) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 9148826 + ... + 9148931.

It is an arithmetic number, because the mean of its divisors is an integer number (247019733).

Almost surely, 2^969781121 is an apocalyptic number.

It is an amenable number.

969781121 is a deficient number, since it is larger than the sum of its proper divisors (18297811).

969781121 is a wasteful number, since it uses less digits than its factorization.

969781121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18297810.

The product of its digits is 54432, while the sum is 44.

The square root of 969781121 is about 31141.3089159720. The cubic root of 969781121 is about 989.8238373080.

The spelling of 969781121 in words is "nine hundred sixty-nine million, seven hundred eighty-one thousand, one hundred twenty-one".