111111099971 has 2 divisors, whose sum is σ = 111111099972. Its totient is φ = 111111099970.

The previous prime is 111111099919. The next prime is 111111099991. The reversal of 111111099971 is 179990111111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111111099971 - 2³⁴ = 93931230787 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (111111099991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555549985 + 55555549986.

It is an arithmetic number, because the mean of its divisors is an integer number (55555549986).

Almost surely, 2^111111099971 is an apocalyptic number.

111111099971 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111099971 is an equidigital number, since it uses as much as digits as its factorization.

111111099971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5103, while the sum is 41.

The spelling of 111111099971 in words is "one hundred eleven billion, one hundred eleven million, ninety-nine thousand, nine hundred seventy-one".