7189121 has 4 divisors (see below), whose sum is σ = 7225812. Its totient is φ = 7152432.

The previous prime is 7189103. The next prime is 7189123. The reversal of 7189121 is 1219817.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1219817 = 61 ⋅19997.

It can be written as a sum of positive squares in 2 ways, for example, as 3748096 + 3441025 = 1936^2 + 1855^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7189121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7189123) 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 in 3 ways as a sum of consecutive naturals, for example, 18050 + ... + 18443.

It is an arithmetic number, because the mean of its divisors is an integer number (1806453).

Almost surely, 2^7189121 is an apocalyptic number.

It is an amenable number.

7189121 is a deficient number, since it is larger than the sum of its proper divisors (36691).

7189121 is a wasteful number, since it uses less digits than its factorization.

7189121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36690.

The product of its digits is 1008, while the sum is 29.

The square root of 7189121 is about 2681.2536247062. The cubic root of 7189121 is about 193.0005727206. Note that the first 3 decimals are identical.

The spelling of 7189121 in words is "seven million, one hundred eighty-nine thousand, one hundred twenty-one".