111439901 has 2 divisors, whose sum is σ = 111439902. Its totient is φ = 111439900.

The previous prime is 111439891. The next prime is 111439903. The reversal of 111439901 is 109934111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56235001 + 55204900 = 7499^2 + 7430^2 .

It is a cyclic number.

It is not a de Polignac number, because 111439901 - 2²² = 107245597 is a prime.

Together with 111439903, 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 (111439903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55719950 + 55719951.

It is an arithmetic number, because the mean of its divisors is an integer number (55719951).

Almost surely, 2^111439901 is an apocalyptic number.

It is an amenable number.

111439901 is a deficient number, since it is larger than the sum of its proper divisors (1).

111439901 is an equidigital number, since it uses as much as digits as its factorization.

111439901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 111439901 is about 10556.5098872686. The cubic root of 111439901 is about 481.2235868789.

The spelling of 111439901 in words is "one hundred eleven million, four hundred thirty-nine thousand, nine hundred one".