99887771 has 2 divisors, whose sum is σ = 99887772. Its totient is φ = 99887770.

The previous prime is 99887759. The next prime is 99887779. The reversal of 99887771 is 17778899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99887771 - 2⁶ = 99887707 is a prime.

It is a Chen prime.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (99887779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49943885 + 49943886.

It is an arithmetic number, because the mean of its divisors is an integer number (49943886).

Almost surely, 2^99887771 is an apocalyptic number.

99887771 is a deficient number, since it is larger than the sum of its proper divisors (1).

99887771 is an equidigital number, since it uses as much as digits as its factorization.

99887771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1778112, while the sum is 56.

The square root of 99887771 is about 9994.3869746973. The cubic root of 99887771 is about 463.9851780714.

The spelling of 99887771 in words is "ninety-nine million, eight hundred eighty-seven thousand, seven hundred seventy-one".