87121839073 has 2 divisors, whose sum is σ = 87121839074. Its totient is φ = 87121839072.

The previous prime is 87121839059. The next prime is 87121839109. The reversal of 87121839073 is 37093812178.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67575562209 + 19546276864 = 259953^2 + 139808^2 .

It is a cyclic number.

It is not a de Polignac number, because 87121839073 - 2²⁹ = 86584968161 is a prime.

It is not a weakly prime, because it can be changed into another prime (87121831073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43560919536 + 43560919537.

It is an arithmetic number, because the mean of its divisors is an integer number (43560919537).

Almost surely, 2^87121839073 is an apocalyptic number.

It is an amenable number.

87121839073 is a deficient number, since it is larger than the sum of its proper divisors (1).

87121839073 is an equidigital number, since it uses as much as digits as its factorization.

87121839073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 49.

The spelling of 87121839073 in words is "eighty-seven billion, one hundred twenty-one million, eight hundred thirty-nine thousand, seventy-three".