111397777 has 2 divisors, whose sum is σ = 111397778. Its totient is φ = 111397776.

The previous prime is 111397771. The next prime is 111397813. The reversal of 111397777 is 777793111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111175936 + 221841 = 10544^2 + 471^2 .

It is an emirp because it is prime and its reverse (777793111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111397777 is a prime.

It is not a weakly prime, because it can be changed into another prime (111397771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55698888 + 55698889.

It is an arithmetic number, because the mean of its divisors is an integer number (55698889).

Almost surely, 2^111397777 is an apocalyptic number.

It is an amenable number.

111397777 is a deficient number, since it is larger than the sum of its proper divisors (1).

111397777 is an equidigital number, since it uses as much as digits as its factorization.

111397777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64827, while the sum is 43.

The square root of 111397777 is about 10554.5145317063. The cubic root of 111397777 is about 481.1629454723.

The spelling of 111397777 in words is "one hundred eleven million, three hundred ninety-seven thousand, seven hundred seventy-seven".