111619901 has 2 divisors, whose sum is σ = 111619902. Its totient is φ = 111619900.

The previous prime is 111619891. The next prime is 111619903. The reversal of 111619901 is 109916111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111619225 + 676 = 10565^2 + 26^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111619901 is a prime.

It is a Sophie Germain prime.

Together with 111619903, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111619903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55809950 + 55809951.

It is an arithmetic number, because the mean of its divisors is an integer number (55809951).

Almost surely, 2^111619901 is an apocalyptic number.

It is an amenable number.

111619901 is a deficient number, since it is larger than the sum of its proper divisors (1).

111619901 is an equidigital number, since it uses as much as digits as its factorization.

111619901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 29.

The square root of 111619901 is about 10565.0319923794. The cubic root of 111619901 is about 481.4825415553.

The spelling of 111619901 in words is "one hundred eleven million, six hundred nineteen thousand, nine hundred one".