87819899 has 2 divisors, whose sum is σ = 87819900. Its totient is φ = 87819898.

The previous prime is 87819839. The next prime is 87819947. The reversal of 87819899 is 99891878.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87819899 - 2⁸ = 87819643 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87819839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43909949 + 43909950.

It is an arithmetic number, because the mean of its divisors is an integer number (43909950).

Almost surely, 2^87819899 is an apocalyptic number.

87819899 is a deficient number, since it is larger than the sum of its proper divisors (1).

87819899 is an equidigital number, since it uses as much as digits as its factorization.

87819899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 59.

The square root of 87819899 is about 9371.2271875139. The cubic root of 87819899 is about 444.4923706905.

The spelling of 87819899 in words is "eighty-seven million, eight hundred nineteen thousand, eight hundred ninety-nine".