1111942257161 has 2 divisors, whose sum is σ = 1111942257162. Its totient is φ = 1111942257160.

The previous prime is 1111942257113. The next prime is 1111942257199. The reversal of 1111942257161 is 1617522491111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 907172431936 + 204769825225 = 952456^2 + 452515^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111942257161 - 2²² = 1111938062857 is a prime.

It is not a weakly prime, because it can be changed into another prime (1111942257961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555971128580 + 555971128581.

It is an arithmetic number, because the mean of its divisors is an integer number (555971128581).

Almost surely, 2^{1111942257161} is an apocalyptic number.

It is an amenable number.

1111942257161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111942257161 is an equidigital number, since it uses as much as digits as its factorization.

1111942257161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 41.

The spelling of 1111942257161 in words is "one trillion, one hundred eleven billion, nine hundred forty-two million, two hundred fifty-seven thousand, one hundred sixty-one".