51449 has 2 divisors, whose sum is σ = 51450. Its totient is φ = 51448.

The previous prime is 51439. The next prime is 51461. The reversal of 51449 is 94415.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40000 + 11449 = 200^2 + 107^2 .

It is a cyclic number.

It is not a de Polignac number, because 51449 - 2⁸ = 51193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25724 + 25725.

It is an arithmetic number, because the mean of its divisors is an integer number (25725).

2⁵¹⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

51449 is a deficient number, since it is larger than the sum of its proper divisors (1).

51449 is an equidigital number, since it uses as much as digits as its factorization.

51449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 23.

The square root of 51449 is about 226.8237201000. The cubic root of 51449 is about 37.1928089542.

The spelling of 51449 in words is "fifty-one thousand, four hundred forty-nine".