1111111109947 has 2 divisors, whose sum is σ = 1111111109948. Its totient is φ = 1111111109946.

The previous prime is 1111111109861. The next prime is 1111111109959. The reversal of 1111111109947 is 7499011111111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1111111109947 - 2²⁷ = 1110976892219 is a prime.

It is not a weakly prime, because it can be changed into another prime (1111111109987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555555554973 + 555555554974.

It is an arithmetic number, because the mean of its divisors is an integer number (555555554974).

Almost surely, 2^{1111111109947} is an apocalyptic number.

1111111109947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111111109947 is an equidigital number, since it uses as much as digits as its factorization.

1111111109947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 37.

The spelling of 1111111109947 in words is "one trillion, one hundred eleven billion, one hundred eleven million, one hundred nine thousand, nine hundred forty-seven".