51405647 has 2 divisors, whose sum is σ = 51405648. Its totient is φ = 51405646.

The previous prime is 51405623. The next prime is 51405701. The reversal of 51405647 is 74650415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51405647 - 2¹⁰ = 51404623 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51405947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25702823 + 25702824.

It is an arithmetic number, because the mean of its divisors is an integer number (25702824).

Almost surely, 2^51405647 is an apocalyptic number.

51405647 is a deficient number, since it is larger than the sum of its proper divisors (1).

51405647 is an equidigital number, since it uses as much as digits as its factorization.

51405647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 51405647 is about 7169.7731484336. The cubic root of 51405647 is about 371.8235929881.

The spelling of 51405647 in words is "fifty-one million, four hundred five thousand, six hundred forty-seven".