87195941689 has 2 divisors, whose sum is σ = 87195941690. Its totient is φ = 87195941688.

The previous prime is 87195941659. The next prime is 87195941711. The reversal of 87195941689 is 98614959178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81719941689 + 5476000000 = 285867^2 + 74000^2 .

It is a cyclic number.

It is not a de Polignac number, because 87195941689 - 2¹⁷ = 87195810617 is a prime.

It is not a weakly prime, because it can be changed into another prime (87195941659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43597970844 + 43597970845.

It is an arithmetic number, because the mean of its divisors is an integer number (43597970845).

Almost surely, 2^87195941689 is an apocalyptic number.

It is an amenable number.

87195941689 is a deficient number, since it is larger than the sum of its proper divisors (1).

87195941689 is an equidigital number, since it uses as much as digits as its factorization.

87195941689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39191040, while the sum is 67.

The spelling of 87195941689 in words is "eighty-seven billion, one hundred ninety-five million, nine hundred forty-one thousand, six hundred eighty-nine".