2154749 has 2 divisors, whose sum is σ = 2154750. Its totient is φ = 2154748.

The previous prime is 2154743. The next prime is 2154791. The reversal of 2154749 is 9474512.

It is a happy number.

2154749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1643524 + 511225 = 1282^2 + 715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2154749 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p₁₅₉₅₇₅ and since 2154749 and 159575 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2154743) 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 as a sum of consecutive naturals, namely, 1077374 + 1077375.

It is an arithmetic number, because the mean of its divisors is an integer number (1077375).

2^2154749 is an apocalyptic number.

It is an amenable number.

2154749 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154749 is an equidigital number, since it uses as much as digits as its factorization.

2154749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 32.

The square root of 2154749 is about 1467.9063321616. The cubic root of 2154749 is about 129.1612469919.

The spelling of 2154749 in words is "two million, one hundred fifty-four thousand, seven hundred forty-nine".