1171098989571 has 24 divisors (see below), whose sum is σ = 1816439615760. Its totient is φ = 669184250112.

The previous prime is 1171098989539. The next prime is 1171098989573. The reversal of 1171098989571 is 1759898901711.

It is not a de Polignac number, because 1171098989571 - 2⁵ = 1171098989539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1171098989573) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11198895 + ... + 11302983.

It is an arithmetic number, because the mean of its divisors is an integer number (75684983990).

Almost surely, 2^{1171098989571} is an apocalyptic number.

1171098989571 is a deficient number, since it is larger than the sum of its proper divisors (645340626189).

1171098989571 is a wasteful number, since it uses less digits than its factorization.

1171098989571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180643 (or 180636 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 66.

The spelling of 1171098989571 in words is "one trillion, one hundred seventy-one billion, ninety-eight million, nine hundred eighty-nine thousand, five hundred seventy-one".