861598115 has 12 divisors (see below), whose sum is σ = 1202720976. Its totient is φ = 590809968.

The previous prime is 861598109. The next prime is 861598121. The reversal of 861598115 is 511895168.

It is an interprime number because it is at equal distance from previous prime (861598109) and next prime (861598121).

It is not a de Polignac number, because 861598115 - 2¹⁴ = 861581731 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1758119 + ... + 1758608.

It is an arithmetic number, because the mean of its divisors is an integer number (100226748).

Almost surely, 2^861598115 is an apocalyptic number.

861598115 is a deficient number, since it is larger than the sum of its proper divisors (341122861).

861598115 is a wasteful number, since it uses less digits than its factorization.

861598115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3516746 (or 3516739 counting only the distinct ones).

The product of its digits is 86400, while the sum is 44.

The square root of 861598115 is about 29352.9915851860. The cubic root of 861598115 is about 951.5572299439.

The spelling of 861598115 in words is "eight hundred sixty-one million, five hundred ninety-eight thousand, one hundred fifteen".