864187853 has 2 divisors, whose sum is σ = 864187854. Its totient is φ = 864187852.

The previous prime is 864187823. The next prime is 864187871. The reversal of 864187853 is 358781468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 561358249 + 302829604 = 23693^2 + 17402^2 .

It is a cyclic number.

It is not a de Polignac number, because 864187853 - 2¹⁸ = 863925709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864187823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432093926 + 432093927.

It is an arithmetic number, because the mean of its divisors is an integer number (432093927).

Almost surely, 2^864187853 is an apocalyptic number.

It is an amenable number.

864187853 is a deficient number, since it is larger than the sum of its proper divisors (1).

864187853 is an equidigital number, since it uses as much as digits as its factorization.

864187853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1290240, while the sum is 50.

The square root of 864187853 is about 29397.0721841479. The cubic root of 864187853 is about 952.5096535052.

The spelling of 864187853 in words is "eight hundred sixty-four million, one hundred eighty-seven thousand, eight hundred fifty-three".