87188449 has 2 divisors, whose sum is σ = 87188450. Its totient is φ = 87188448.

The previous prime is 87188419. The next prime is 87188483. The reversal of 87188449 is 94488178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69422224 + 17766225 = 8332^2 + 4215^2 .

It is a cyclic number.

It is not a de Polignac number, because 87188449 - 2⁹ = 87187937 is a prime.

It is not a weakly prime, because it can be changed into another prime (87188419) 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, 43594224 + 43594225.

It is an arithmetic number, because the mean of its divisors is an integer number (43594225).

Almost surely, 2^87188449 is an apocalyptic number.

It is an amenable number.

87188449 is a deficient number, since it is larger than the sum of its proper divisors (1).

87188449 is an equidigital number, since it uses as much as digits as its factorization.

87188449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 49.

The square root of 87188449 is about 9337.4755153628. The cubic root of 87188449 is about 443.4244649687.

The spelling of 87188449 in words is "eighty-seven million, one hundred eighty-eight thousand, four hundred forty-nine".