9951297120 has 432 divisors, whose sum is σ = 37220011920. Its totient is φ = 2510466048.

The previous prime is 9951297079. The next prime is 9951297131. The reversal of 9951297120 is 217921599.

9951297120 is a `hidden beast` number, since 9 + 9 + 512 + 9 + 7 + 120 = 666.

It is a tau number, because it is divible by the number of its divisors (432).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 14035326 + ... + 14036034.

It is an arithmetic number, because the mean of its divisors is an integer number (86157435).

Almost surely, 2^9951297120 is an apocalyptic number.

9951297120 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9951297120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18610005960).

9951297120 is an abundant number, since it is smaller than the sum of its proper divisors (27268714800).

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

9951297120 is a wasteful number, since it uses less digits than its factorization.

9951297120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777 (or 738 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 45.

The square root of 9951297120 is about 99756.1883794685. The cubic root of 9951297120 is about 2150.9314240843.

The spelling of 9951297120 in words is "nine billion, nine hundred fifty-one million, two hundred ninety-seven thousand, one hundred twenty".