2123549 has 4 divisors (see below), whose sum is σ = 2127840. Its totient is φ = 2119260.

The previous prime is 2123491. The next prime is 2123557. The reversal of 2123549 is 9453212.

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 2123549 - 2¹⁶ = 2058013 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 (2120549) 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, 1289 + ... + 2430.

It is an arithmetic number, because the mean of its divisors is an integer number (531960).

2^2123549 is an apocalyptic number.

It is an amenable number.

2123549 is a deficient number, since it is larger than the sum of its proper divisors (4291).

2123549 is an equidigital number, since it uses as much as digits as its factorization.

2123549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4290.

The product of its digits is 2160, while the sum is 26.

The square root of 2123549 is about 1457.2401998298. The cubic root of 2123549 is about 128.5348106772.

The spelling of 2123549 in words is "two million, one hundred twenty-three thousand, five hundred forty-nine".