111878149 has 2 divisors, whose sum is σ = 111878150. Its totient is φ = 111878148.

The previous prime is 111878113. The next prime is 111878153. The reversal of 111878149 is 941878111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111830625 + 47524 = 10575^2 + 218^2 .

It is an emirp because it is prime and its reverse (941878111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111878149 - 2⁹ = 111877637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111878449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55939074 + 55939075.

It is an arithmetic number, because the mean of its divisors is an integer number (55939075).

Almost surely, 2^111878149 is an apocalyptic number.

It is an amenable number.

111878149 is a deficient number, since it is larger than the sum of its proper divisors (1).

111878149 is an equidigital number, since it uses as much as digits as its factorization.

111878149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 40.

The square root of 111878149 is about 10577.2467589633. The cubic root of 111878149 is about 481.8535809229.

The spelling of 111878149 in words is "one hundred eleven million, eight hundred seventy-eight thousand, one hundred forty-nine".