1181531241 has 54 divisors (see below), whose sum is σ = 1940093610. Its totient is φ = 692366400.

The previous prime is 1181531233. The next prime is 1181531269. The reversal of 1181531241 is 1421351811.

1181531241 is a `hidden beast` number, since 11 + 81 + 531 + 2 + 41 = 666.

It can be written as a sum of positive squares in only one way, i.e., 762919641 + 418611600 = 27621^2 + 20460^2 .

It is not a de Polignac number, because 1181531241 - 2³ = 1181531233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1181531291) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 1045965 + ... + 1047093.

Almost surely, 2^1181531241 is an apocalyptic number.

1181531241 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1181531241 is a deficient number, since it is larger than the sum of its proper divisors (758562369).

1181531241 is a wasteful number, since it uses less digits than its factorization.

1181531241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219 (or 1174 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 1181531241 is about 34373.4089231778. The cubic root of 1181531241 is about 1057.1786968814.

The spelling of 1181531241 in words is "one billion, one hundred eighty-one million, five hundred thirty-one thousand, two hundred forty-one".