861886147 has 2 divisors, whose sum is σ = 861886148. Its totient is φ = 861886146.

The previous prime is 861886121. The next prime is 861886231. The reversal of 861886147 is 741688168.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861886147 - 2¹⁵ = 861853379 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 861886147.

It is not a weakly prime, because it can be changed into another prime (861886117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430943073 + 430943074.

It is an arithmetic number, because the mean of its divisors is an integer number (430943074).

Almost surely, 2^861886147 is an apocalyptic number.

861886147 is a deficient number, since it is larger than the sum of its proper divisors (1).

861886147 is an equidigital number, since it uses as much as digits as its factorization.

861886147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 516096, while the sum is 49.

The square root of 861886147 is about 29357.8975234944. The cubic root of 861886147 is about 951.6632532323.

The spelling of 861886147 in words is "eight hundred sixty-one million, eight hundred eighty-six thousand, one hundred forty-seven".