991222222199 has 16 divisors (see below), whose sum is σ = 1096643038464. Its totient is φ = 888354868800.

The previous prime is 991222222189. The next prime is 991222222229.

991222222199 is nontrivially palindromic in base 10.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-991222222199 is a prime.

It is a super-2 number, since 2×991222222199² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991222222169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13116707 + ... + 13192059.

It is an arithmetic number, because the mean of its divisors is an integer number (68540189904).

Almost surely, 2^991222222199 is an apocalyptic number.

991222222199 is a deficient number, since it is larger than the sum of its proper divisors (105420816265).

991222222199 is a wasteful number, since it uses less digits than its factorization.

991222222199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92278.

The product of its digits is 419904, while the sum is 50.

The spelling of 991222222199 in words is "nine hundred ninety-one billion, two hundred twenty-two million, two hundred twenty-two thousand, one hundred ninety-nine".