111621403 has 2 divisors, whose sum is σ = 111621404. Its totient is φ = 111621402.

The previous prime is 111621379. The next prime is 111621407. The reversal of 111621403 is 304126111.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111621403 is a prime.

It is not a weakly prime, because it can be changed into another prime (111621407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55810701 + 55810702.

It is an arithmetic number, because the mean of its divisors is an integer number (55810702).

Almost surely, 2^111621403 is an apocalyptic number.

111621403 is a deficient number, since it is larger than the sum of its proper divisors (1).

111621403 is an equidigital number, since it uses as much as digits as its factorization.

111621403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 111621403 is about 10565.1030756922. The cubic root of 111621403 is about 481.4847012166.

Adding to 111621403 its reverse (304126111), we get a palindrome (415747514).

The spelling of 111621403 in words is "one hundred eleven million, six hundred twenty-one thousand, four hundred three".