111121199977 has 2 divisors, whose sum is σ = 111121199978. Its totient is φ = 111121199976.

The previous prime is 111121199953. The next prime is 111121200041. The reversal of 111121199977 is 779991121111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78271812441 + 32849387536 = 279771^2 + 181244^2 .

It is a cyclic number.

It is not a de Polignac number, because 111121199977 - 2¹⁹ = 111120675689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111121199977.

It is not a weakly prime, because it can be changed into another prime (111121193977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55560599988 + 55560599989.

It is an arithmetic number, because the mean of its divisors is an integer number (55560599989).

Almost surely, 2^111121199977 is an apocalyptic number.

It is an amenable number.

111121199977 is a deficient number, since it is larger than the sum of its proper divisors (1).

111121199977 is an equidigital number, since it uses as much as digits as its factorization.

111121199977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71442, while the sum is 49.

The spelling of 111121199977 in words is "one hundred eleven billion, one hundred twenty-one million, one hundred ninety-nine thousand, nine hundred seventy-seven".