9913992887 has 4 divisors (see below), whose sum is σ = 10345036080. Its totient is φ = 9482949696.

The previous prime is 9913992877. The next prime is 9913992911. The reversal of 9913992887 is 7882993199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7882993199 = 2557 ⋅3082907.

It is a cyclic number.

It is not a de Polignac number, because 9913992887 - 2⁴ = 9913992871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9913992877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215521562 + ... + 215521607.

It is an arithmetic number, because the mean of its divisors is an integer number (2586259020).

Almost surely, 2^9913992887 is an apocalyptic number.

9913992887 is a deficient number, since it is larger than the sum of its proper divisors (431043193).

9913992887 is a wasteful number, since it uses less digits than its factorization.

9913992887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431043192.

The product of its digits is 17635968, while the sum is 65.

The square root of 9913992887 is about 99569.0357842236. The cubic root of 9913992887 is about 2148.2403404115.

The spelling of 9913992887 in words is "nine billion, nine hundred thirteen million, nine hundred ninety-two thousand, eight hundred eighty-seven".