1181506131 has 24 divisors (see below), whose sum is σ = 1897191296. Its totient is φ = 703624320.

The previous prime is 1181506057. The next prime is 1181506153. The reversal of 1181506131 is 1316051811.

It is a happy number.

It is not a de Polignac number, because 1181506131 - 2²² = 1177311827 is a prime.

It is a super-2 number, since 2×1181506131² = 2791913475181178322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1181506095 and 1181506104.

It is not an unprimeable number, because it can be changed into a prime (1181506031) 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, 159250 + ... + 166503.

Almost surely, 2^1181506131 is an apocalyptic number.

1181506131 is a deficient number, since it is larger than the sum of its proper divisors (715685165).

1181506131 is a wasteful number, since it uses less digits than its factorization.

1181506131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325803 (or 325800 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 1181506131 is about 34373.0436679675. The cubic root of 1181506131 is about 1057.1712077452.

Adding to 1181506131 its reverse (1316051811), we get a palindrome (2497557942).

The spelling of 1181506131 in words is "one billion, one hundred eighty-one million, five hundred six thousand, one hundred thirty-one".