1181271399120 has 200 divisors, whose sum is σ = 4105637784864. Its totient is φ = 314782495488.

The previous prime is 1181271399107. The next prime is 1181271399131. The reversal of 1181271399120 is 219931721811.

1181271399120 is a `hidden beast` number, since 1 + 18 + 127 + 1 + 399 + 120 = 666.

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 39 ways as a sum of consecutive naturals, for example, 9183087 + ... + 9310833.

Almost surely, 2^{1181271399120} is an apocalyptic number.

1181271399120 is a gapful number since it is divisible by the number (10) 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 1181271399120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2052818892432).

1181271399120 is an abundant number, since it is smaller than the sum of its proper divisors (2924366385744).

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

1181271399120 is a wasteful number, since it uses less digits than its factorization.

1181271399120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129199 (or 129184 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 45.

The spelling of 1181271399120 in words is "one trillion, one hundred eighty-one billion, two hundred seventy-one million, three hundred ninety-nine thousand, one hundred twenty".