861265907 has 2 divisors, whose sum is σ = 861265908. Its totient is φ = 861265906.

The previous prime is 861265879. The next prime is 861265943. The reversal of 861265907 is 709562168.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861265907 - 2¹⁰ = 861264883 is a prime.

It is not a weakly prime, because it can be changed into another prime (861265987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430632953 + 430632954.

It is an arithmetic number, because the mean of its divisors is an integer number (430632954).

Almost surely, 2^861265907 is an apocalyptic number.

861265907 is a deficient number, since it is larger than the sum of its proper divisors (1).

861265907 is an equidigital number, since it uses as much as digits as its factorization.

861265907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 861265907 is about 29347.3321956187. The cubic root of 861265907 is about 951.4349163209.

The spelling of 861265907 in words is "eight hundred sixty-one million, two hundred sixty-five thousand, nine hundred seven".