87702289921 has 2 divisors, whose sum is σ = 87702289922. Its totient is φ = 87702289920.

The previous prime is 87702289903. The next prime is 87702289973. The reversal of 87702289921 is 12998220778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68063070321 + 19639219600 = 260889^2 + 140140^2 .

It is a cyclic number.

It is not a de Polignac number, because 87702289921 - 2¹³ = 87702281729 is a prime.

It is not a weakly prime, because it can be changed into another prime (87702289321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43851144960 + 43851144961.

It is an arithmetic number, because the mean of its divisors is an integer number (43851144961).

Almost surely, 2^87702289921 is an apocalyptic number.

It is an amenable number.

87702289921 is a deficient number, since it is larger than the sum of its proper divisors (1).

87702289921 is an equidigital number, since it uses as much as digits as its factorization.

87702289921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2032128, while the sum is 55.

The spelling of 87702289921 in words is "eighty-seven billion, seven hundred two million, two hundred eighty-nine thousand, nine hundred twenty-one".