131106561 has 16 divisors (see below), whose sum is σ = 179419968. Its totient is φ = 85107200.

The previous prime is 131106559. The next prime is 131106589. The reversal of 131106561 is 165601131.

It is a cyclic number.

It is not a de Polignac number, because 131106561 - 2¹ = 131106559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131106511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119626 + ... + 120716.

It is an arithmetic number, because the mean of its divisors is an integer number (11213748).

Almost surely, 2^131106561 is an apocalyptic number.

It is an amenable number.

131106561 is a deficient number, since it is larger than the sum of its proper divisors (48313407).

131106561 is a wasteful number, since it uses less digits than its factorization.

131106561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 131106561 is about 11450.1773348713. The cubic root of 131106561 is about 508.0129796527.

Adding to 131106561 its reverse (165601131), we get a palindrome (296707692).

The spelling of 131106561 in words is "one hundred thirty-one million, one hundred six thousand, five hundred sixty-one".