109211999 has 16 divisors (see below), whose sum is σ = 122680320. Its totient is φ = 96526080.

The previous prime is 109211969. The next prime is 109212023. The reversal of 109211999 is 999112901.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 109211999 - 2¹⁶ = 109146463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109211909) 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, 46739 + ... + 49019.

It is an arithmetic number, because the mean of its divisors is an integer number (7667520).

Almost surely, 2^109211999 is an apocalyptic number.

109211999 is a deficient number, since it is larger than the sum of its proper divisors (13468321).

109211999 is a wasteful number, since it uses less digits than its factorization.

109211999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2450.

The product of its (nonzero) digits is 13122, while the sum is 41.

The square root of 109211999 is about 10450.4544877244. The cubic root of 109211999 is about 477.9951082872.

The spelling of 109211999 in words is "one hundred nine million, two hundred eleven thousand, nine hundred ninety-nine".