131228311 has 2 divisors, whose sum is σ = 131228312. Its totient is φ = 131228310.

The previous prime is 131228299. The next prime is 131228329. The reversal of 131228311 is 113822131.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131228311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131228341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65614155 + 65614156.

It is an arithmetic number, because the mean of its divisors is an integer number (65614156).

Almost surely, 2^131228311 is an apocalyptic number.

131228311 is a deficient number, since it is larger than the sum of its proper divisors (1).

131228311 is an equidigital number, since it uses as much as digits as its factorization.

131228311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 22.

The square root of 131228311 is about 11455.4926127164. The cubic root of 131228311 is about 508.1701836963.

The spelling of 131228311 in words is "one hundred thirty-one million, two hundred twenty-eight thousand, three hundred eleven".