131220111 has 8 divisors (see below), whose sum is σ = 190865664. Its totient is φ = 79527320.

The previous prime is 131220101. The next prime is 131220143. The reversal of 131220111 is 111022131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131220111 - 2⁵ = 131220079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131220101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1988151 + ... + 1988216.

It is an arithmetic number, because the mean of its divisors is an integer number (23858208).

Almost surely, 2^131220111 is an apocalyptic number.

131220111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

131220111 is a deficient number, since it is larger than the sum of its proper divisors (59645553).

131220111 is a wasteful number, since it uses less digits than its factorization.

131220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3976381.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 131220111 is about 11455.1347002120. The cubic root of 131220111 is about 508.1595988810.

Adding to 131220111 its reverse (111022131), we get a palindrome (242242242).

The spelling of 131220111 in words is "one hundred thirty-one million, two hundred twenty thousand, one hundred eleven".