87219469693 has 2 divisors, whose sum is σ = 87219469694. Its totient is φ = 87219469692.

The previous prime is 87219469639. The next prime is 87219469741. The reversal of 87219469693 is 39696491278.

Together with previous prime (87219469639) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86660761924 + 558707769 = 294382^2 + 23637^2 .

It is a cyclic number.

It is not a de Polignac number, because 87219469693 - 2²⁹ = 86682598781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87219469613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43609734846 + 43609734847.

It is an arithmetic number, because the mean of its divisors is an integer number (43609734847).

Almost surely, 2^87219469693 is an apocalyptic number.

It is an amenable number.

87219469693 is a deficient number, since it is larger than the sum of its proper divisors (1).

87219469693 is an equidigital number, since it uses as much as digits as its factorization.

87219469693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35271936, while the sum is 64.

The spelling of 87219469693 in words is "eighty-seven billion, two hundred nineteen million, four hundred sixty-nine thousand, six hundred ninety-three".