861707999 has 2 divisors, whose sum is σ = 861708000. Its totient is φ = 861707998.

The previous prime is 861707981. The next prime is 861708013. The reversal of 861707999 is 999707168.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861707999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861707699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430853999 + 430854000.

It is an arithmetic number, because the mean of its divisors is an integer number (430854000).

Almost surely, 2^861707999 is an apocalyptic number.

861707999 is a deficient number, since it is larger than the sum of its proper divisors (1).

861707999 is an equidigital number, since it uses as much as digits as its factorization.

861707999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1714608, while the sum is 56.

The square root of 861707999 is about 29354.8632938394. The cubic root of 861707999 is about 951.5976805392.

The spelling of 861707999 in words is "eight hundred sixty-one million, seven hundred seven thousand, nine hundred ninety-nine".