864138189097 has 4 divisors (see below), whose sum is σ = 864297835780. Its totient is φ = 863978542416.

The previous prime is 864138189091. The next prime is 864138189113. The reversal of 864138189097 is 790981831468.

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 533149689241 + 330988499856 = 730171^2 + 575316^2 .

It is a cyclic number.

It is not a de Polignac number, because 864138189097 - 2³¹ = 861990705449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864138189091) 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, 79815222 + ... + 79826047.

It is an arithmetic number, because the mean of its divisors is an integer number (216074458945).

Almost surely, 2^864138189097 is an apocalyptic number.

It is an amenable number.

864138189097 is a deficient number, since it is larger than the sum of its proper divisors (159646683).

864138189097 is a wasteful number, since it uses less digits than its factorization.

864138189097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159646682.

The product of its (nonzero) digits is 20901888, while the sum is 64.

The spelling of 864138189097 in words is "eight hundred sixty-four billion, one hundred thirty-eight million, one hundred eighty-nine thousand, ninety-seven".