111220999 has 2 divisors, whose sum is σ = 111221000. Its totient is φ = 111220998.

The previous prime is 111220969. The next prime is 111221023. The reversal of 111220999 is 999022111.

It is a strong prime.

It is an emirp because it is prime and its reverse (999022111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111220999 - 2¹³ = 111212807 is a prime.

It is a super-2 number, since 2×111220999² = 24740221237116002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111220969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610499 + 55610500.

It is an arithmetic number, because the mean of its divisors is an integer number (55610500).

Almost surely, 2^111220999 is an apocalyptic number.

111220999 is a deficient number, since it is larger than the sum of its proper divisors (1).

111220999 is an equidigital number, since it uses as much as digits as its factorization.

111220999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 34.

The square root of 111220999 is about 10546.1366860097. The cubic root of 111220999 is about 480.9082903114.

The spelling of 111220999 in words is "one hundred eleven million, two hundred twenty thousand, nine hundred ninety-nine".