51254239 has 2 divisors, whose sum is σ = 51254240. Its totient is φ = 51254238.

The previous prime is 51254207. The next prime is 51254257. The reversal of 51254239 is 93245215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51254239 - 2⁵ = 51254207 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51254239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51254939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25627119 + 25627120.

It is an arithmetic number, because the mean of its divisors is an integer number (25627120).

Almost surely, 2^51254239 is an apocalyptic number.

51254239 is a deficient number, since it is larger than the sum of its proper divisors (1).

51254239 is an equidigital number, since it uses as much as digits as its factorization.

51254239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 31.

The square root of 51254239 is about 7159.2065901188. The cubic root of 51254239 is about 371.4581828815.

The spelling of 51254239 in words is "fifty-one million, two hundred fifty-four thousand, two hundred thirty-nine".