87944999 has 2 divisors, whose sum is σ = 87945000. Its totient is φ = 87944998.

The previous prime is 87944971. The next prime is 87945001. The reversal of 87944999 is 99944978.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87944999 - 2⁸ = 87944743 is a prime.

It is a super-2 number, since 2×87944999² = 15468645698220002, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 87945001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87944929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43972499 + 43972500.

It is an arithmetic number, because the mean of its divisors is an integer number (43972500).

Almost surely, 2^87944999 is an apocalyptic number.

87944999 is a deficient number, since it is larger than the sum of its proper divisors (1).

87944999 is an equidigital number, since it uses as much as digits as its factorization.

87944999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 59.

The square root of 87944999 is about 9377.8994982885. The cubic root of 87944999 is about 444.7033312791.

The spelling of 87944999 in words is "eighty-seven million, nine hundred forty-four thousand, nine hundred ninety-nine".