111439729 has 2 divisors, whose sum is σ = 111439730. Its totient is φ = 111439728.

The previous prime is 111439673. The next prime is 111439753. The reversal of 111439729 is 927934111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106915600 + 4524129 = 10340^2 + 2127^2 .

It is a cyclic number.

It is not a de Polignac number, because 111439729 - 2¹⁵ = 111406961 is a prime.

It is not a weakly prime, because it can be changed into another prime (111439799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55719864 + 55719865.

It is an arithmetic number, because the mean of its divisors is an integer number (55719865).

Almost surely, 2^111439729 is an apocalyptic number.

It is an amenable number.

111439729 is a deficient number, since it is larger than the sum of its proper divisors (1).

111439729 is an equidigital number, since it uses as much as digits as its factorization.

111439729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 37.

The square root of 111439729 is about 10556.5017406336. The cubic root of 111439729 is about 481.2233393000.

The spelling of 111439729 in words is "one hundred eleven million, four hundred thirty-nine thousand, seven hundred twenty-nine".