861432899 has 2 divisors, whose sum is σ = 861432900. Its totient is φ = 861432898.

The previous prime is 861432893. The next prime is 861432941. The reversal of 861432899 is 998234168.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861432899 - 2⁴ = 861432883 is a prime.

It is not a weakly prime, because it can be changed into another prime (861432893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430716449 + 430716450.

It is an arithmetic number, because the mean of its divisors is an integer number (430716450).

Almost surely, 2^861432899 is an apocalyptic number.

861432899 is a deficient number, since it is larger than the sum of its proper divisors (1).

861432899 is an equidigital number, since it uses as much as digits as its factorization.

861432899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 50.

The square root of 861432899 is about 29350.1771544909. The cubic root of 861432899 is about 951.4964040104.

The spelling of 861432899 in words is "eight hundred sixty-one million, four hundred thirty-two thousand, eight hundred ninety-nine".