2154261 has 4 divisors (see below), whose sum is σ = 2872352. Its totient is φ = 1436172.

The previous prime is 2154259. The next prime is 2154281. The reversal of 2154261 is 1624512.

2154261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 2154261 - 2¹ = 2154259 is a prime.

It is a super-2 number, since 2×2154261² = 9281680912242, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154241) 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, 359041 + ... + 359046.

It is an arithmetic number, because the mean of its divisors is an integer number (718088).

2^2154261 is an apocalyptic number.

It is an amenable number.

2154261 is a deficient number, since it is larger than the sum of its proper divisors (718091).

2154261 is an equidigital number, since it uses as much as digits as its factorization.

2154261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718090.

The product of its digits is 480, while the sum is 21.

The square root of 2154261 is about 1467.7400996089. The cubic root of 2154261 is about 129.1514955936.

Adding to 2154261 its reverse (1624512), we get a palindrome (3778773).

It can be divided in two parts, 2154 and 261, that added together give a triangular number (2415 = T₆₉).

The spelling of 2154261 in words is "two million, one hundred fifty-four thousand, two hundred sixty-one".