1111997925881 has 2 divisors, whose sum is σ = 1111997925882. Its totient is φ = 1111997925880.

The previous prime is 1111997925869. The next prime is 1111997925887. The reversal of 1111997925881 is 1885297991111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1109038565881 + 2959360000 = 1053109^2 + 54400^2 .

It is an emirp because it is prime and its reverse (1885297991111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1111997925881 is a prime.

It is a super-2 number, since 2×1111997925881² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1111997925887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555998962940 + 555998962941.

It is an arithmetic number, because the mean of its divisors is an integer number (555998962941).

Almost surely, 2^{1111997925881} is an apocalyptic number.

It is an amenable number.

1111997925881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111997925881 is an equidigital number, since it uses as much as digits as its factorization.

1111997925881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 62.

The spelling of 1111997925881 in words is "one trillion, one hundred eleven billion, nine hundred ninety-seven million, nine hundred twenty-five thousand, eight hundred eighty-one".