111838549 has 2 divisors, whose sum is σ = 111838550. Its totient is φ = 111838548.

The previous prime is 111838547. The next prime is 111838567. The reversal of 111838549 is 945838111.

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., 110355025 + 1483524 = 10505^2 + 1218^2 .

It is a cyclic number.

It is not a de Polignac number, because 111838549 - 2¹ = 111838547 is a prime.

It is a super-2 number, since 2×111838549² = 25015722084850802, which contains 22 as substring.

Together with 111838547, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111838543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55919274 + 55919275.

It is an arithmetic number, because the mean of its divisors is an integer number (55919275).

Almost surely, 2^111838549 is an apocalyptic number.

It is an amenable number.

111838549 is a deficient number, since it is larger than the sum of its proper divisors (1).

111838549 is an equidigital number, since it uses as much as digits as its factorization.

111838549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 40.

The square root of 111838549 is about 10575.3746505739. The cubic root of 111838549 is about 481.7967224754.

The spelling of 111838549 in words is "one hundred eleven million, eight hundred thirty-eight thousand, five hundred forty-nine".