111111111149 has 2 divisors, whose sum is σ = 111111111150. Its totient is φ = 111111111148.

The previous prime is 111111111103. The next prime is 111111111187. The reversal of 111111111149 is 941111111111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81935055049 + 29176056100 = 286243^2 + 170810^2 .

It is an emirp because it is prime and its reverse (941111111111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111111111149 - 2¹² = 111111107053 is a prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111111111049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555555574 + 55555555575.

It is an arithmetic number, because the mean of its divisors is an integer number (55555555575).

Almost surely, 2^111111111149 is an apocalyptic number.

It is an amenable number.

111111111149 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111111149 is an equidigital number, since it uses as much as digits as its factorization.

111111111149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 23.

The spelling of 111111111149 in words is "one hundred eleven billion, one hundred eleven million, one hundred eleven thousand, one hundred forty-nine".