51808291 has 2 divisors, whose sum is σ = 51808292. Its totient is φ = 51808290.

The previous prime is 51808283. The next prime is 51808301. The reversal of 51808291 is 19280815.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51808291 - 2³ = 51808283 is a prime.

It is not a weakly prime, because it can be changed into another prime (51808271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25904145 + 25904146.

It is an arithmetic number, because the mean of its divisors is an integer number (25904146).

Almost surely, 2^51808291 is an apocalyptic number.

51808291 is a deficient number, since it is larger than the sum of its proper divisors (1).

51808291 is an equidigital number, since it uses as much as digits as its factorization.

51808291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 51808291 is about 7197.7976492813. The cubic root of 51808291 is about 372.7918611071.

The spelling of 51808291 in words is "fifty-one million, eight hundred eight thousand, two hundred ninety-one".