111211948957 has 2 divisors, whose sum is σ = 111211948958. Its totient is φ = 111211948956.

The previous prime is 111211948951. The next prime is 111211948973. The reversal of 111211948957 is 759849112111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97285352836 + 13926596121 = 311906^2 + 118011^2 .

It is a cyclic number.

It is not a de Polignac number, because 111211948957 - 2²⁷ = 111077731229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111211948957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111211948951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55605974478 + 55605974479.

It is an arithmetic number, because the mean of its divisors is an integer number (55605974479).

Almost surely, 2^111211948957 is an apocalyptic number.

It is an amenable number.

111211948957 is a deficient number, since it is larger than the sum of its proper divisors (1).

111211948957 is an equidigital number, since it uses as much as digits as its factorization.

111211948957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 49.

The spelling of 111211948957 in words is "one hundred eleven billion, two hundred eleven million, nine hundred forty-eight thousand, nine hundred fifty-seven".