111000009971 has 2 divisors, whose sum is σ = 111000009972. Its totient is φ = 111000009970.

The previous prime is 111000009961. The next prime is 111000010007. The reversal of 111000009971 is 179900000111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111000009971 - 2⁶ = 111000009907 is a prime.

It is not a weakly prime, because it can be changed into another prime (111000009941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55500004985 + 55500004986.

It is an arithmetic number, because the mean of its divisors is an integer number (55500004986).

Almost surely, 2^111000009971 is an apocalyptic number.

111000009971 is a deficient number, since it is larger than the sum of its proper divisors (1).

111000009971 is an equidigital number, since it uses as much as digits as its factorization.

111000009971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 567, while the sum is 29.

The spelling of 111000009971 in words is "one hundred eleven billion, nine thousand, nine hundred seventy-one".