111920139 has 12 divisors (see below), whose sum is σ = 168691536. Its totient is φ = 71369232.

The previous prime is 111920131. The next prime is 111920161. The reversal of 111920139 is 931029111.

It is not a de Polignac number, because 111920139 - 2³ = 111920131 is a prime.

It is a super-2 number, since 2×111920139² = 25052235027558642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (111920131) 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 in 11 ways as a sum of consecutive naturals, for example, 270132 + ... + 270545.

It is an arithmetic number, because the mean of its divisors is an integer number (14057628).

Almost surely, 2^111920139 is an apocalyptic number.

111920139 is a deficient number, since it is larger than the sum of its proper divisors (56771397).

111920139 is a wasteful number, since it uses less digits than its factorization.

111920139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540706 (or 540703 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The square root of 111920139 is about 10579.2314938279. The cubic root of 111920139 is about 481.9138563246.

It can be divided in two parts, 1119 and 20139, that multiplied together give a triangular number (22535541 = T₆₇₁₃).

The spelling of 111920139 in words is "one hundred eleven million, nine hundred twenty thousand, one hundred thirty-nine".