131555111 has 2 divisors, whose sum is σ = 131555112. Its totient is φ = 131555110.

The previous prime is 131555087. The next prime is 131555117. The reversal of 131555111 is 111555131.

It is a strong prime.

It is an emirp because it is prime and its reverse (111555131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131555111 - 2¹⁴ = 131538727 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131555117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65777555 + 65777556.

It is an arithmetic number, because the mean of its divisors is an integer number (65777556).

Almost surely, 2^131555111 is an apocalyptic number.

131555111 is a deficient number, since it is larger than the sum of its proper divisors (1).

131555111 is an equidigital number, since it uses as much as digits as its factorization.

131555111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 375, while the sum is 23.

The square root of 131555111 is about 11469.7476432570. The cubic root of 131555111 is about 508.5916688407.

The spelling of 131555111 in words is "one hundred thirty-one million, five hundred fifty-five thousand, one hundred eleven".