111621641 has 2 divisors, whose sum is σ = 111621642. Its totient is φ = 111621640.

The previous prime is 111621623. The next prime is 111621647. The reversal of 111621641 is 146126111.

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., 56550400 + 55071241 = 7520^2 + 7421^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111621641 is a prime.

It is not a weakly prime, because it can be changed into another prime (111621647) 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, 55810820 + 55810821.

It is an arithmetic number, because the mean of its divisors is an integer number (55810821).

Almost surely, 2^111621641 is an apocalyptic number.

It is an amenable number.

111621641 is a deficient number, since it is larger than the sum of its proper divisors (1).

111621641 is an equidigital number, since it uses as much as digits as its factorization.

111621641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 23.

The square root of 111621641 is about 10565.1143391825. The cubic root of 111621641 is about 481.4850434248.

Adding to 111621641 its reverse (146126111), we get a palindrome (257747752).

The spelling of 111621641 in words is "one hundred eleven million, six hundred twenty-one thousand, six hundred forty-one".