1171287825 has 24 divisors (see below), whose sum is σ = 1937727168. Its totient is φ = 624300480.

The previous prime is 1171287791. The next prime is 1171287841. The reversal of 1171287825 is 5287821711.

It is a happy number.

It is not a de Polignac number, because 1171287825 - 2⁸ = 1171287569 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 150172 + ... + 157778.

It is an arithmetic number, because the mean of its divisors is an integer number (80738632).

Almost surely, 2^1171287825 is an apocalyptic number.

1171287825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1171287825 is a deficient number, since it is larger than the sum of its proper divisors (766439343).

1171287825 is a wasteful number, since it uses less digits than its factorization.

1171287825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9673 (or 9668 counting only the distinct ones).

The product of its digits is 62720, while the sum is 42.

The square root of 1171287825 is about 34224.0825297041. The cubic root of 1171287825 is about 1054.1147159603.

The spelling of 1171287825 in words is "one billion, one hundred seventy-one million, two hundred eighty-seven thousand, eight hundred twenty-five".