9981969156 has 36 divisors (see below), whose sum is σ = 25399314304. Its totient is φ = 3305286000.

The previous prime is 9981969139. The next prime is 9981969163. The reversal of 9981969156 is 6519691899.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 9981969093 and 9981969102.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 912700 + ... + 923571.

Almost surely, 2^9981969156 is an apocalyptic number.

It is an amenable number.

9981969156 is an abundant number, since it is smaller than the sum of its proper divisors (15417345148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9981969156 is a wasteful number, since it uses less digits than its factorization.

9981969156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836432 (or 1836427 counting only the distinct ones).

The product of its digits is 9447840, while the sum is 63.

The square root of 9981969156 is about 99909.8051044040. The cubic root of 9981969156 is about 2153.1390351344.

The spelling of 9981969156 in words is "nine billion, nine hundred eighty-one million, nine hundred sixty-nine thousand, one hundred fifty-six".