51640847 has 2 divisors, whose sum is σ = 51640848. Its totient is φ = 51640846.

The previous prime is 51640843. The next prime is 51640859. The reversal of 51640847 is 74804615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51640847 - 2² = 51640843 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51640843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25820423 + 25820424.

It is an arithmetic number, because the mean of its divisors is an integer number (25820424).

Almost surely, 2^51640847 is an apocalyptic number.

51640847 is a deficient number, since it is larger than the sum of its proper divisors (1).

51640847 is an equidigital number, since it uses as much as digits as its factorization.

51640847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 51640847 is about 7186.1566222843. The cubic root of 51640847 is about 372.3898075035.

The spelling of 51640847 in words is "fifty-one million, six hundred forty thousand, eight hundred forty-seven".