131118561 has 96 divisors (see below), whose sum is σ = 245145600. Its totient is φ = 68856480.

The previous prime is 131118557. The next prime is 131118587. The reversal of 131118561 is 165811131.

It is a happy number.

It is not a de Polignac number, because 131118561 - 2² = 131118557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (131118511) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 943230 + ... + 943368.

It is an arithmetic number, because the mean of its divisors is an integer number (2553600).

Almost surely, 2^131118561 is an apocalyptic number.

It is an amenable number.

131118561 is a deficient number, since it is larger than the sum of its proper divisors (114027039).

131118561 is a wasteful number, since it uses less digits than its factorization.

131118561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216 (or 203 counting only the distinct ones).

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

The square root of 131118561 is about 11450.7013322329. The cubic root of 131118561 is about 508.0284784188.

Adding to 131118561 its reverse (165811131), we get a palindrome (296929692).

The spelling of 131118561 in words is "one hundred thirty-one million, one hundred eighteen thousand, five hundred sixty-one".