864906121 has 8 divisors (see below), whose sum is σ = 895102920. Its totient is φ = 834734208.

The previous prime is 864906103. The next prime is 864906131. The reversal of 864906121 is 121609468.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 129140496 + 735765625 = 11364^2 + 27125^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864906121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864906131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89875 + ... + 99031.

It is an arithmetic number, because the mean of its divisors is an integer number (111887865).

Almost surely, 2^864906121 is an apocalyptic number.

It is an amenable number.

864906121 is a deficient number, since it is larger than the sum of its proper divisors (30196799).

864906121 is a wasteful number, since it uses less digits than its factorization.

864906121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12443.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 864906121 is about 29409.2863055192. The cubic root of 864906121 is about 952.7734725902.

The spelling of 864906121 in words is "eight hundred sixty-four million, nine hundred six thousand, one hundred twenty-one".