111776813 has 2 divisors, whose sum is σ = 111776814. Its totient is φ = 111776812.

The previous prime is 111776809. The next prime is 111776831. The reversal of 111776813 is 318677111.

Together with next prime (111776831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65577604 + 46199209 = 8098^2 + 6797^2 .

It is a cyclic number.

It is not a de Polignac number, because 111776813 - 2² = 111776809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111776893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55888406 + 55888407.

It is an arithmetic number, because the mean of its divisors is an integer number (55888407).

Almost surely, 2^111776813 is an apocalyptic number.

It is an amenable number.

111776813 is a deficient number, since it is larger than the sum of its proper divisors (1).

111776813 is an equidigital number, since it uses as much as digits as its factorization.

111776813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 35.

The square root of 111776813 is about 10572.4553912514. The cubic root of 111776813 is about 481.7080539515.

The spelling of 111776813 in words is "one hundred eleven million, seven hundred seventy-six thousand, eight hundred thirteen".