87981199 has 2 divisors, whose sum is σ = 87981200. Its totient is φ = 87981198.

The previous prime is 87981181. The next prime is 87981209. The reversal of 87981199 is 99118978.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87981199 - 2⁵ = 87981167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87981109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43990599 + 43990600.

It is an arithmetic number, because the mean of its divisors is an integer number (43990600).

Almost surely, 2^87981199 is an apocalyptic number.

87981199 is a deficient number, since it is larger than the sum of its proper divisors (1).

87981199 is an equidigital number, since it uses as much as digits as its factorization.

87981199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 52.

The square root of 87981199 is about 9379.8293694502. The cubic root of 87981199 is about 444.7643393049.

The spelling of 87981199 in words is "eighty-seven million, nine hundred eighty-one thousand, one hundred ninety-nine".