111621613 has 2 divisors, whose sum is σ = 111621614. Its totient is φ = 111621612.

The previous prime is 111621589. The next prime is 111621619. The reversal of 111621613 is 316126111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95316169 + 16305444 = 9763^2 + 4038^2 .

It is a cyclic number.

It is not a de Polignac number, because 111621613 - 2⁵ = 111621581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111621619) 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, 55810806 + 55810807.

It is an arithmetic number, because the mean of its divisors is an integer number (55810807).

Almost surely, 2^111621613 is an apocalyptic number.

It is an amenable number.

111621613 is a deficient number, since it is larger than the sum of its proper divisors (1).

111621613 is an equidigital number, since it uses as much as digits as its factorization.

111621613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 22.

The square root of 111621613 is about 10565.1130140666. The cubic root of 111621613 is about 481.4850031651.

Adding to 111621613 its reverse (316126111), we get a palindrome (427747724).

The spelling of 111621613 in words is "one hundred eleven million, six hundred twenty-one thousand, six hundred thirteen".