111553621 has 2 divisors, whose sum is σ = 111553622. Its totient is φ = 111553620.

The previous prime is 111553613. The next prime is 111553639. The reversal of 111553621 is 126355111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82555396 + 28998225 = 9086^2 + 5385^2 .

It is a cyclic number.

It is not a de Polignac number, because 111553621 - 2³ = 111553613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111553121) 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 as a sum of consecutive naturals, namely, 55776810 + 55776811.

It is an arithmetic number, because the mean of its divisors is an integer number (55776811).

Almost surely, 2^111553621 is an apocalyptic number.

It is an amenable number.

111553621 is a deficient number, since it is larger than the sum of its proper divisors (1).

111553621 is an equidigital number, since it uses as much as digits as its factorization.

111553621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 25.

The square root of 111553621 is about 10561.8947637249. The cubic root of 111553621 is about 481.3872210935.

The spelling of 111553621 in words is "one hundred eleven million, five hundred fifty-three thousand, six hundred twenty-one".