1171210545 has 24 divisors (see below), whose sum is σ = 2031270696. Its totient is φ = 624284928.

The previous prime is 1171210517. The next prime is 1171210561. The reversal of 1171210545 is 5450121711.

1171210545 is a `hidden beast` number, since 117 + 1 + 2 + 1 + 0 + 545 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5875776 + 1165334769 = 2424^2 + 34137^2 .

It is not a de Polignac number, because 1171210545 - 2⁸ = 1171210289 is a prime.

It is a Curzon number.

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, 83349 + ... + 96381.

It is an arithmetic number, because the mean of its divisors is an integer number (84636279).

Almost surely, 2^1171210545 is an apocalyptic number.

1171210545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1171210545 is a deficient number, since it is larger than the sum of its proper divisors (860060151).

1171210545 is a wasteful number, since it uses less digits than its factorization.

1171210545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15041 (or 15038 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 27.

The square root of 1171210545 is about 34222.9534815451. The cubic root of 1171210545 is about 1054.0915324253.

The spelling of 1171210545 in words is "one billion, one hundred seventy-one million, two hundred ten thousand, five hundred forty-five".