111621659 has 2 divisors, whose sum is σ = 111621660. Its totient is φ = 111621658.

The previous prime is 111621649. The next prime is 111621661. The reversal of 111621659 is 956126111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111621659 - 2⁸ = 111621403 is a prime.

Together with 111621661, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111621619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55810829 + 55810830.

It is an arithmetic number, because the mean of its divisors is an integer number (55810830).

Almost surely, 2^111621659 is an apocalyptic number.

111621659 is a deficient number, since it is larger than the sum of its proper divisors (1).

111621659 is an equidigital number, since it uses as much as digits as its factorization.

111621659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 32.

The square root of 111621659 is about 10565.1151910426. The cubic root of 111621659 is about 481.4850693061.

It can be divided in two parts, 11162 and 1659, that added together give a palindrome (12821).

The spelling of 111621659 in words is "one hundred eleven million, six hundred twenty-one thousand, six hundred fifty-nine".