871667999 has 2 divisors, whose sum is σ = 871668000. Its totient is φ = 871667998.

The previous prime is 871667983. The next prime is 871668019. The reversal of 871667999 is 999766178.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 871667999 - 2⁴ = 871667983 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (871667099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435833999 + 435834000.

It is an arithmetic number, because the mean of its divisors is an integer number (435834000).

Almost surely, 2^871667999 is an apocalyptic number.

871667999 is a deficient number, since it is larger than the sum of its proper divisors (1).

871667999 is an equidigital number, since it uses as much as digits as its factorization.

871667999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10287648, while the sum is 62.

The square root of 871667999 is about 29524.0240990282. The cubic root of 871667999 is about 955.2499730309.

The spelling of 871667999 in words is "eight hundred seventy-one million, six hundred sixty-seven thousand, nine hundred ninety-nine".