51224249 has 2 divisors, whose sum is σ = 51224250. Its totient is φ = 51224248.

The previous prime is 51224231. The next prime is 51224279. The reversal of 51224249 is 94242215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51222649 + 1600 = 7157^2 + 40^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51224249 is a prime.

It is a super-2 number, since 2×51224249² = 5247847371228002, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51224279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25612124 + 25612125.

It is an arithmetic number, because the mean of its divisors is an integer number (25612125).

Almost surely, 2^51224249 is an apocalyptic number.

It is an amenable number.

51224249 is a deficient number, since it is larger than the sum of its proper divisors (1).

51224249 is an equidigital number, since it uses as much as digits as its factorization.

51224249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 29.

The square root of 51224249 is about 7157.1117778053. Note that the first 3 decimals coincide. The cubic root of 51224249 is about 371.3857192532.

The spelling of 51224249 in words is "fifty-one million, two hundred twenty-four thousand, two hundred forty-nine".