87193109189 has 2 divisors, whose sum is σ = 87193109190. Its totient is φ = 87193109188.

The previous prime is 87193109167. The next prime is 87193109221. The reversal of 87193109189 is 98190139178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85366230625 + 1826878564 = 292175^2 + 42742^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87193109189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87193109389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43596554594 + 43596554595.

It is an arithmetic number, because the mean of its divisors is an integer number (43596554595).

Almost surely, 2^87193109189 is an apocalyptic number.

It is an amenable number.

87193109189 is a deficient number, since it is larger than the sum of its proper divisors (1).

87193109189 is an equidigital number, since it uses as much as digits as its factorization.

87193109189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 56.

The spelling of 87193109189 in words is "eighty-seven billion, one hundred ninety-three million, one hundred nine thousand, one hundred eighty-nine".