51500447 has 2 divisors, whose sum is σ = 51500448. Its totient is φ = 51500446.

The previous prime is 51500443. The next prime is 51500453. The reversal of 51500447 is 74400515.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51500447 - 2² = 51500443 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51500441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25750223 + 25750224.

It is an arithmetic number, because the mean of its divisors is an integer number (25750224).

Almost surely, 2^51500447 is an apocalyptic number.

51500447 is a deficient number, since it is larger than the sum of its proper divisors (1).

51500447 is an equidigital number, since it uses as much as digits as its factorization.

51500447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 51500447 is about 7176.3811911018. The cubic root of 51500447 is about 372.0520194530.

The spelling of 51500447 in words is "fifty-one million, five hundred thousand, four hundred forty-seven".