1181957165 has 16 divisors (see below), whose sum is σ = 1427356080. Its totient is φ = 939578880.

The previous prime is 1181957137. The next prime is 1181957201. The reversal of 1181957165 is 5617591811.

It can be written as a sum of positive squares in 8 ways, for example, as 22486564 + 1159470601 = 4742^2 + 34051^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1181957165 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1076897 + ... + 1077993.

It is an arithmetic number, because the mean of its divisors is an integer number (89209755).

Almost surely, 2^1181957165 is an apocalyptic number.

It is an amenable number.

1181957165 is a deficient number, since it is larger than the sum of its proper divisors (245398915).

1181957165 is a wasteful number, since it uses less digits than its factorization.

1181957165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2272.

The product of its digits is 75600, while the sum is 44.

The square root of 1181957165 is about 34379.6039098766. The cubic root of 1181957165 is about 1057.3057138879.

The spelling of 1181957165 in words is "one billion, one hundred eighty-one million, nine hundred fifty-seven thousand, one hundred sixty-five".