864198847 has 2 divisors, whose sum is σ = 864198848. Its totient is φ = 864198846.

The previous prime is 864198817. The next prime is 864198857. The reversal of 864198847 is 748891468.

It is a happy number.

864198847 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864198847 is a prime.

It is a super-2 number, since 2×864198847² = 1493679294312258818, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864198817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432099423 + 432099424.

It is an arithmetic number, because the mean of its divisors is an integer number (432099424).

Almost surely, 2^864198847 is an apocalyptic number.

864198847 is a deficient number, since it is larger than the sum of its proper divisors (1).

864198847 is an equidigital number, since it uses as much as digits as its factorization.

864198847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3096576, while the sum is 55.

The square root of 864198847 is about 29397.2591749639. The cubic root of 864198847 is about 952.5136926913.

It can be divided in two parts, 86419 and 8847, that added together give a triangular number (95266 = T₄₃₆).

The spelling of 864198847 in words is "eight hundred sixty-four million, one hundred ninety-eight thousand, eight hundred forty-seven".