87841697149 has 2 divisors, whose sum is σ = 87841697150. Its totient is φ = 87841697148.

The previous prime is 87841697137. The next prime is 87841697197. The reversal of 87841697149 is 94179614878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59106361924 + 28735335225 = 243118^2 + 169515^2 .

It is a cyclic number.

It is not a de Polignac number, because 87841697149 - 2⁹ = 87841696637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87841697549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43920848574 + 43920848575.

It is an arithmetic number, because the mean of its divisors is an integer number (43920848575).

Almost surely, 2^87841697149 is an apocalyptic number.

It is an amenable number.

87841697149 is a deficient number, since it is larger than the sum of its proper divisors (1).

87841697149 is an equidigital number, since it uses as much as digits as its factorization.

87841697149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24385536, while the sum is 64.

The spelling of 87841697149 in words is "eighty-seven billion, eight hundred forty-one million, six hundred ninety-seven thousand, one hundred forty-nine".