9991612502 has 4 divisors (see below), whose sum is σ = 14987418756. Its totient is φ = 4995806250.

The previous prime is 9991612447. The next prime is 9991612531. The reversal of 9991612502 is 2052161999.

9991612502 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2052161999 = 409 ⋅5017511.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2497903124 + ... + 2497903127.

It is an arithmetic number, because the mean of its divisors is an integer number (3746854689).

Almost surely, 2^9991612502 is an apocalyptic number.

9991612502 is a deficient number, since it is larger than the sum of its proper divisors (4995806254).

9991612502 is a wasteful number, since it uses less digits than its factorization.

9991612502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4995806253.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 9991612502 is about 99958.0537125448. The cubic root of 9991612502 is about 2153.8321776596.

The spelling of 9991612502 in words is "nine billion, nine hundred ninety-one million, six hundred twelve thousand, five hundred two".