861594947 has 2 divisors, whose sum is σ = 861594948. Its totient is φ = 861594946.

The previous prime is 861594941. The next prime is 861594961. The reversal of 861594947 is 749495168.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861594947 - 2⁶ = 861594883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (861594941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430797473 + 430797474.

It is an arithmetic number, because the mean of its divisors is an integer number (430797474).

Almost surely, 2^861594947 is an apocalyptic number.

861594947 is a deficient number, since it is larger than the sum of its proper divisors (1).

861594947 is an equidigital number, since it uses as much as digits as its factorization.

861594947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 53.

The square root of 861594947 is about 29352.9376213012. The cubic root of 861594947 is about 951.5560636860.

It can be divided in two parts, 861594 and 947, that multiplied together give a palindrome (815929518).

The spelling of 861594947 in words is "eight hundred sixty-one million, five hundred ninety-four thousand, nine hundred forty-seven".