131660111 has 4 divisors (see below), whose sum is σ = 143629224. Its totient is φ = 119691000.

The previous prime is 131660083. The next prime is 131660129. The reversal of 131660111 is 111066131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111066131 = 11 ⋅10096921.

It is not a de Polignac number, because 131660111 - 2¹⁸ = 131397967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131660141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5984540 + ... + 5984561.

It is an arithmetic number, because the mean of its divisors is an integer number (35907306).

Almost surely, 2^131660111 is an apocalyptic number.

131660111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

131660111 is a deficient number, since it is larger than the sum of its proper divisors (11969113).

131660111 is a wasteful number, since it uses less digits than its factorization.

131660111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11969112.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 131660111 is about 11474.3239888021. The cubic root of 131660111 is about 508.7269427539.

The spelling of 131660111 in words is "one hundred thirty-one million, six hundred sixty thousand, one hundred eleven".