31111111191049 has 2 divisors, whose sum is σ = 31111111191050. Its totient is φ = 31111111191048.

The previous prime is 31111111191047. The next prime is 31111111191053. The reversal of 31111111191049 is 94019111111113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30040341542649 + 1070769648400 = 5480907^2 + 1034780^2 .

It is a cyclic number.

It is not a de Polignac number, because 31111111191049 - 2¹ = 31111111191047 is a prime.

Together with 31111111191047, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31111111191047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15555555595524 + 15555555595525.

It is an arithmetic number, because the mean of its divisors is an integer number (15555555595525).

Almost surely, 2^{31111111191049} is an apocalyptic number.

It is an amenable number.

31111111191049 is a deficient number, since it is larger than the sum of its proper divisors (1).

31111111191049 is an equidigital number, since it uses as much as digits as its factorization.

31111111191049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 34.

The spelling of 31111111191049 in words is "thirty-one trillion, one hundred eleven billion, one hundred eleven million, one hundred ninety-one thousand, forty-nine".