87198188039 has 2 divisors, whose sum is σ = 87198188040. Its totient is φ = 87198188038.

The previous prime is 87198188017. The next prime is 87198188083. The reversal of 87198188039 is 93088189178.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87198188039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87198188089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43599094019 + 43599094020.

It is an arithmetic number, because the mean of its divisors is an integer number (43599094020).

Almost surely, 2^87198188039 is an apocalyptic number.

87198188039 is a deficient number, since it is larger than the sum of its proper divisors (1).

87198188039 is an equidigital number, since it uses as much as digits as its factorization.

87198188039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6967296, while the sum is 62.

The spelling of 87198188039 in words is "eighty-seven billion, one hundred ninety-eight million, one hundred eighty-eight thousand, thirty-nine".