87869911 has 2 divisors, whose sum is σ = 87869912. Its totient is φ = 87869910.

The previous prime is 87869909. The next prime is 87869921. The reversal of 87869911 is 11996878.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87869911 - 2¹ = 87869909 is a prime.

It is a super-2 number, since 2×87869911² = 15442242518295842, which contains 22 as substring.

Together with 87869909, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87869921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43934955 + 43934956.

It is an arithmetic number, because the mean of its divisors is an integer number (43934956).

Almost surely, 2^87869911 is an apocalyptic number.

87869911 is a deficient number, since it is larger than the sum of its proper divisors (1).

87869911 is an equidigital number, since it uses as much as digits as its factorization.

87869911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 49.

The square root of 87869911 is about 9373.8951882342. The cubic root of 87869911 is about 444.5767317301.

The spelling of 87869911 in words is "eighty-seven million, eight hundred sixty-nine thousand, nine hundred eleven".