1171872489 has 16 divisors (see below), whose sum is σ = 1580040000. Its totient is φ = 772509696.

The previous prime is 1171872487. The next prime is 1171872497. The reversal of 1171872489 is 9842781711.

It is not a de Polignac number, because 1171872489 - 2¹ = 1171872487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1171872487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148362 + ... + 156060.

It is an arithmetic number, because the mean of its divisors is an integer number (98752500).

Almost surely, 2^1171872489 is an apocalyptic number.

It is an amenable number.

1171872489 is a deficient number, since it is larger than the sum of its proper divisors (408167511).

1171872489 is a wasteful number, since it uses less digits than its factorization.

1171872489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8264.

The product of its digits is 225792, while the sum is 48.

The square root of 1171872489 is about 34232.6231685508. The cubic root of 1171872489 is about 1054.2900786100.

The spelling of 1171872489 in words is "one billion, one hundred seventy-one million, eight hundred seventy-two thousand, four hundred eighty-nine".