9981969157 has 8 divisors (see below), whose sum is σ = 10775139840. Its totient is φ = 9218729520.

The previous prime is 9981969139. The next prime is 9981969163. The reversal of 9981969157 is 7519691899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9981969157 - 2²³ = 9973580549 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 (9981969857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7482069 + ... + 7483402.

It is an arithmetic number, because the mean of its divisors is an integer number (1346892480).

Almost surely, 2^9981969157 is an apocalyptic number.

It is an amenable number.

9981969157 is a deficient number, since it is larger than the sum of its proper divisors (793170683).

9981969157 is a wasteful number, since it uses less digits than its factorization.

9981969157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14965523.

The product of its digits is 11022480, while the sum is 64.

The square root of 9981969157 is about 99909.8051094086. The cubic root of 9981969157 is about 2153.1390352063.

The spelling of 9981969157 in words is "nine billion, nine hundred eighty-one million, nine hundred sixty-nine thousand, one hundred fifty-seven".