864519121 has 2 divisors, whose sum is σ = 864519122. Its totient is φ = 864519120.

The previous prime is 864519113. The next prime is 864519127. The reversal of 864519121 is 121915468.

864519121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 528310225 + 336208896 = 22985^2 + 18336^2 .

It is a cyclic number.

It is not a de Polignac number, because 864519121 - 2³ = 864519113 is a prime.

It is a super-2 number, since 2×864519121² = 1494786621149225282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (864519127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432259560 + 432259561.

It is an arithmetic number, because the mean of its divisors is an integer number (432259561).

Almost surely, 2^864519121 is an apocalyptic number.

It is an amenable number.

864519121 is a deficient number, since it is larger than the sum of its proper divisors (1).

864519121 is an equidigital number, since it uses as much as digits as its factorization.

864519121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 37.

The square root of 864519121 is about 29402.7060149232. The cubic root of 864519121 is about 952.6313460505.

The spelling of 864519121 in words is "eight hundred sixty-four million, five hundred nineteen thousand, one hundred twenty-one".