131201111 has 4 divisors (see below), whose sum is σ = 133992672. Its totient is φ = 128409552.

The previous prime is 131201101. The next prime is 131201143. The reversal of 131201111 is 111102131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131201111 - 2¹⁰ = 131200087 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131201092 and 131201101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131201101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1395710 + ... + 1395803.

It is an arithmetic number, because the mean of its divisors is an integer number (33498168).

Almost surely, 2^131201111 is an apocalyptic number.

131201111 is a deficient number, since it is larger than the sum of its proper divisors (2791561).

131201111 is an equidigital number, since it uses as much as digits as its factorization.

131201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2791560.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 131201111 is about 11454.3053477721. The cubic root of 131201111 is about 508.1350713948.

Adding to 131201111 its reverse (111102131), we get a palindrome (242303242).

The spelling of 131201111 in words is "one hundred thirty-one million, two hundred one thousand, one hundred eleven".