111242639 has 2 divisors, whose sum is σ = 111242640. Its totient is φ = 111242638.

The previous prime is 111242627. The next prime is 111242641. The reversal of 111242639 is 936242111.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111242639 is a prime.

Together with 111242641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111242699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55621319 + 55621320.

It is an arithmetic number, because the mean of its divisors is an integer number (55621320).

Almost surely, 2^111242639 is an apocalyptic number.

111242639 is a deficient number, since it is larger than the sum of its proper divisors (1).

111242639 is an equidigital number, since it uses as much as digits as its factorization.

111242639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 29.

The square root of 111242639 is about 10547.1626042268. The cubic root of 111242639 is about 480.9394780086.

The spelling of 111242639 in words is "one hundred eleven million, two hundred forty-two thousand, six hundred thirty-nine".