1171208538 has 16 divisors (see below), whose sum is σ = 2602685760. Its totient is φ = 390402828.

The previous prime is 1171208531. The next prime is 1171208567. The reversal of 1171208538 is 8358021711.

1171208538 is a `hidden beast` number, since 117 + 1 + 2 + 0 + 8 + 538 = 666.

It is not an unprimeable number, because it can be changed into a prime (1171208531) 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 7 ways as a sum of consecutive naturals, for example, 10844470 + ... + 10844577.

It is an arithmetic number, because the mean of its divisors is an integer number (162667860).

Almost surely, 2^1171208538 is an apocalyptic number.

1171208538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1171208538 is an abundant number, since it is smaller than the sum of its proper divisors (1431477222).

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

1171208538 is a wasteful number, since it uses less digits than its factorization.

1171208538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21689058 (or 21689052 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 1171208538 is about 34222.9241591072. The cubic root of 1171208538 is about 1054.0909303238.

The spelling of 1171208538 in words is "one billion, one hundred seventy-one million, two hundred eight thousand, five hundred thirty-eight".