87013889 has 2 divisors, whose sum is σ = 87013890. Its totient is φ = 87013888.

The previous prime is 87013859. The next prime is 87013907. The reversal of 87013889 is 98831078.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48163600 + 38850289 = 6940^2 + 6233^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87013889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87013859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43506944 + 43506945.

It is an arithmetic number, because the mean of its divisors is an integer number (43506945).

Almost surely, 2^87013889 is an apocalyptic number.

It is an amenable number.

87013889 is a deficient number, since it is larger than the sum of its proper divisors (1).

87013889 is an equidigital number, since it uses as much as digits as its factorization.

87013889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 87013889 is about 9328.1235519262. The cubic root of 87013889 is about 443.1283405394.

The spelling of 87013889 in words is "eighty-seven million, thirteen thousand, eight hundred eighty-nine".