131601111 has 4 divisors (see below), whose sum is σ = 175468152. Its totient is φ = 87734072.

The previous prime is 131601077. The next prime is 131601139. The reversal of 131601111 is 111106131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111106131 = 3 ⋅37035377.

It is a cyclic number.

It is not a de Polignac number, because 131601111 - 2⁶ = 131601047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131601191) 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, 21933516 + ... + 21933521.

It is an arithmetic number, because the mean of its divisors is an integer number (43867038).

Almost surely, 2^131601111 is an apocalyptic number.

131601111 is a deficient number, since it is larger than the sum of its proper divisors (43867041).

131601111 is an equidigital number, since it uses as much as digits as its factorization.

131601111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43867040.

The product of its (nonzero) digits is 18, while the sum is 15.

The square root of 131601111 is about 11471.7527431513. The cubic root of 131601111 is about 508.6509405540.

Adding to 131601111 its reverse (111106131), we get a palindrome (242707242).

The spelling of 131601111 in words is "one hundred thirty-one million, six hundred one thousand, one hundred eleven".