87513709919 has 4 divisors (see below), whose sum is σ = 87514861896. Its totient is φ = 87512557944.

The previous prime is 87513709891. The next prime is 87513709937. The reversal of 87513709919 is 91990731578.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87513709919 is a prime.

It is a super-2 number, since 2×87513709919² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87513709939) 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 in 3 ways as a sum of consecutive naturals, for example, 453329 + ... + 616874.

It is an arithmetic number, because the mean of its divisors is an integer number (21878715474).

Almost surely, 2^87513709919 is an apocalyptic number.

87513709919 is a deficient number, since it is larger than the sum of its proper divisors (1151977).

87513709919 is a wasteful number, since it uses less digits than its factorization.

87513709919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151976.

The product of its (nonzero) digits is 4286520, while the sum is 59.

The spelling of 87513709919 in words is "eighty-seven billion, five hundred thirteen million, seven hundred nine thousand, nine hundred nineteen".