131261111 has 2 divisors, whose sum is σ = 131261112. Its totient is φ = 131261110.

The previous prime is 131261087. The next prime is 131261147. The reversal of 131261111 is 111162131.

It is a m-pointer prime, because the next prime (131261147) can be obtained adding 131261111 to its product of digits (36).

It is a weak prime.

It is an emirp because it is prime and its reverse (111162131) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131261111 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131261111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131261411) 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 as a sum of consecutive naturals, namely, 65630555 + 65630556.

It is an arithmetic number, because the mean of its divisors is an integer number (65630556).

Almost surely, 2^131261111 is an apocalyptic number.

131261111 is a deficient number, since it is larger than the sum of its proper divisors (1).

131261111 is an equidigital number, since it uses as much as digits as its factorization.

131261111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36, while the sum is 17.

The square root of 131261111 is about 11456.9241509229. The cubic root of 131261111 is about 508.2125185487.

The spelling of 131261111 in words is "one hundred thirty-one million, two hundred sixty-one thousand, one hundred eleven".