51663439 has 2 divisors, whose sum is σ = 51663440. Its totient is φ = 51663438.

The previous prime is 51663431. The next prime is 51663449. The reversal of 51663439 is 93436615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51663439 - 2³ = 51663431 is a prime.

It is a super-2 number, since 2×51663439² = 5338221858613442, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 51663398 and 51663407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51663431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25831719 + 25831720.

It is an arithmetic number, because the mean of its divisors is an integer number (25831720).

Almost surely, 2^51663439 is an apocalyptic number.

51663439 is a deficient number, since it is larger than the sum of its proper divisors (1).

51663439 is an equidigital number, since it uses as much as digits as its factorization.

51663439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 37.

The square root of 51663439 is about 7187.7283615896. The cubic root of 51663439 is about 372.4441043406. Note that the first 3 decimals are identical.

The spelling of 51663439 in words is "fifty-one million, six hundred sixty-three thousand, four hundred thirty-nine".