1171989356 has 12 divisors (see below), whose sum is σ = 2106413568. Its totient is φ = 570156912.

The previous prime is 1171989353. The next prime is 1171989359. The reversal of 1171989356 is 6539891711.

It is an interprime number because it is at equal distance from previous prime (1171989353) and next prime (1171989359).

It is not an unprimeable number, because it can be changed into a prime (1171989353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3959276 + ... + 3959571.

It is an arithmetic number, because the mean of its divisors is an integer number (175534464).

Almost surely, 2^1171989356 is an apocalyptic number.

It is an amenable number.

1171989356 is a deficient number, since it is larger than the sum of its proper divisors (934424212).

1171989356 is a wasteful number, since it uses less digits than its factorization.

1171989356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7918888 (or 7918886 counting only the distinct ones).

The product of its digits is 408240, while the sum is 50.

The square root of 1171989356 is about 34234.3300796145. The cubic root of 1171989356 is about 1054.3251244089.

The spelling of 1171989356 in words is "one billion, one hundred seventy-one million, nine hundred eighty-nine thousand, three hundred fifty-six".