864939121 has 8 divisors (see below), whose sum is σ = 889931880. Its totient is φ = 840031488.

The previous prime is 864939083. The next prime is 864939133. The reversal of 864939121 is 121939468.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 89038096 + 775901025 = 9436^2 + 27855^2 .

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 864939121 - 2⁹ = 864938609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864939151) 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 7 ways as a sum of consecutive naturals, for example, 376 + ... + 41593.

It is an arithmetic number, because the mean of its divisors is an integer number (111241485).

Almost surely, 2^864939121 is an apocalyptic number.

It is an amenable number.

864939121 is a deficient number, since it is larger than the sum of its proper divisors (24992759).

864939121 is a wasteful number, since it uses less digits than its factorization.

864939121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42563.

The product of its digits is 93312, while the sum is 43.

The square root of 864939121 is about 29409.8473474447. The cubic root of 864939121 is about 952.7855899457.

The spelling of 864939121 in words is "eight hundred sixty-four million, nine hundred thirty-nine thousand, one hundred twenty-one".