2155109 has 4 divisors (see below), whose sum is σ = 2351040. Its totient is φ = 1959180.

The previous prime is 2155103. The next prime is 2155121. The reversal of 2155109 is 9015512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2155109 - 2⁸ = 2154853 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97949 + ... + 97970.

It is an arithmetic number, because the mean of its divisors is an integer number (587760).

2^2155109 is an apocalyptic number.

It is an amenable number.

2155109 is a deficient number, since it is larger than the sum of its proper divisors (195931).

2155109 is a wasteful number, since it uses less digits than its factorization.

2155109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195930.

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 2155109 is about 1468.0289506682. The cubic root of 2155109 is about 129.1684397028.

The spelling of 2155109 in words is "two million, one hundred fifty-five thousand, one hundred nine".