111621623 has 2 divisors, whose sum is σ = 111621624. Its totient is φ = 111621622.

The previous prime is 111621619. The next prime is 111621641. The reversal of 111621623 is 326126111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111621623 - 2² = 111621619 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111621613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55810811 + 55810812.

It is an arithmetic number, because the mean of its divisors is an integer number (55810812).

Almost surely, 2^111621623 is an apocalyptic number.

111621623 is a deficient number, since it is larger than the sum of its proper divisors (1).

111621623 is an equidigital number, since it uses as much as digits as its factorization.

111621623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 23.

The square root of 111621623 is about 10565.1134873223. The cubic root of 111621623 is about 481.4850175435.

Adding to 111621623 its reverse (326126111), we get a palindrome (437747734).

The spelling of 111621623 in words is "one hundred eleven million, six hundred twenty-one thousand, six hundred twenty-three".