2123551 has 8 divisors (see below), whose sum is σ = 2190240. Its totient is φ = 2057952.

The previous prime is 2123491. The next prime is 2123557. The reversal of 2123551 is 1553212.

2123551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2123551 - 2⁷ = 2123423 is a prime.

It is a Duffinian number.

2123551 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123557) 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 7 ways as a sum of consecutive naturals, for example, 5265 + ... + 5653.

It is an arithmetic number, because the mean of its divisors is an integer number (273780).

2^2123551 is an apocalyptic number.

2123551 is a deficient number, since it is larger than the sum of its proper divisors (66689).

2123551 is a wasteful number, since it uses less digits than its factorization.

2123551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545.

The product of its digits is 300, while the sum is 19.

The square root of 2123551 is about 1457.2408860583. The cubic root of 2123551 is about 128.5348510294.

Adding to 2123551 its reverse (1553212), we get a palindrome (3676763).

The spelling of 2123551 in words is "two million, one hundred twenty-three thousand, five hundred fifty-one".