51255439 has 2 divisors, whose sum is σ = 51255440. Its totient is φ = 51255438.

The previous prime is 51255401. The next prime is 51255517. The reversal of 51255439 is 93455215.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51255439 - 2⁹ = 51254927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51255739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25627719 + 25627720.

It is an arithmetic number, because the mean of its divisors is an integer number (25627720).

Almost surely, 2^51255439 is an apocalyptic number.

51255439 is a deficient number, since it is larger than the sum of its proper divisors (1).

51255439 is an equidigital number, since it uses as much as digits as its factorization.

51255439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27000, while the sum is 34.

The square root of 51255439 is about 7159.2903977978. The cubic root of 51255439 is about 371.4610818050.

The spelling of 51255439 in words is "fifty-one million, two hundred fifty-five thousand, four hundred thirty-nine".