111291857 has 2 divisors, whose sum is σ = 111291858. Its totient is φ = 111291856.

The previous prime is 111291811. The next prime is 111291863. The reversal of 111291857 is 758192111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65918161 + 45373696 = 8119^2 + 6736^2 .

It is an emirp because it is prime and its reverse (758192111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111291857 - 2⁶ = 111291793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111294857) 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, 55645928 + 55645929.

It is an arithmetic number, because the mean of its divisors is an integer number (55645929).

Almost surely, 2^111291857 is an apocalyptic number.

It is an amenable number.

111291857 is a deficient number, since it is larger than the sum of its proper divisors (1).

111291857 is an equidigital number, since it uses as much as digits as its factorization.

111291857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 35.

The square root of 111291857 is about 10549.4955803583. The cubic root of 111291857 is about 481.0103962264.

The spelling of 111291857 in words is "one hundred eleven million, two hundred ninety-one thousand, eight hundred fifty-seven".