87239513129 has 4 divisors (see below), whose sum is σ = 87262277076. Its totient is φ = 87216749184.

The previous prime is 87239513113. The next prime is 87239513147. The reversal of 87239513129 is 92131593278.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92131593278 = 2 ⋅46065796639.

It can be written as a sum of positive squares in 2 ways, for example, as 14036799529 + 73202713600 = 118477^2 + 270560^2 .

It is a cyclic number.

It is not a de Polignac number, because 87239513129 - 2⁴ = 87239513113 is a prime.

It is a super-2 number, since 2×87239513129² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87239513149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11376224 + ... + 11383889.

It is an arithmetic number, because the mean of its divisors is an integer number (21815569269).

Almost surely, 2^87239513129 is an apocalyptic number.

It is an amenable number.

87239513129 is a deficient number, since it is larger than the sum of its proper divisors (22763947).

87239513129 is a wasteful number, since it uses less digits than its factorization.

87239513129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22763946.

The product of its digits is 816480, while the sum is 50.

The spelling of 87239513129 in words is "eighty-seven billion, two hundred thirty-nine million, five hundred thirteen thousand, one hundred twenty-nine".