1171151280 has 240 divisors, whose sum is σ = 4262914656. Its totient is φ = 286433280.

The previous prime is 1171151231. The next prime is 1171151281. The reversal of 1171151280 is 821511711.

1171151280 is a `hidden beast` number, since 1 + 1 + 71 + 1 + 512 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is not an unprimeable number, because it can be changed into a prime (1171151281) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1974664 + ... + 1975256.

Almost surely, 2^1171151280 is an apocalyptic number.

1171151280 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 1171151280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2131457328).

1171151280 is an abundant number, since it is smaller than the sum of its proper divisors (3091763376).

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

1171151280 is a wasteful number, since it uses less digits than its factorization.

1171151280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836 (or 827 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 27.

The square root of 1171151280 is about 34222.0876043528. The cubic root of 1171151280 is about 1054.0737525910.

Adding to 1171151280 its reverse (821511711), we get a palindrome (1992662991).

The spelling of 1171151280 in words is "one billion, one hundred seventy-one million, one hundred fifty-one thousand, two hundred eighty".