111211099957 has 2 divisors, whose sum is σ = 111211099958. Its totient is φ = 111211099956.

The previous prime is 111211099949. The next prime is 111211100023. The reversal of 111211099957 is 759990112111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109578212676 + 1632887281 = 331026^2 + 40409^2 .

It is a cyclic number.

It is not a de Polignac number, because 111211099957 - 2³ = 111211099949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111211099057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55605549978 + 55605549979.

It is an arithmetic number, because the mean of its divisors is an integer number (55605549979).

Almost surely, 2^111211099957 is an apocalyptic number.

It is an amenable number.

111211099957 is a deficient number, since it is larger than the sum of its proper divisors (1).

111211099957 is an equidigital number, since it uses as much as digits as its factorization.

111211099957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51030, while the sum is 46.

The spelling of 111211099957 in words is "one hundred eleven billion, two hundred eleven million, ninety-nine thousand, nine hundred fifty-seven".