51909287 has 2 divisors, whose sum is σ = 51909288. Its totient is φ = 51909286.

The previous prime is 51909257. The next prime is 51909293. The reversal of 51909287 is 78290915.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51909287 - 2⁸ = 51909031 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 (51909227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25954643 + 25954644.

It is an arithmetic number, because the mean of its divisors is an integer number (25954644).

Almost surely, 2^51909287 is an apocalyptic number.

51909287 is a deficient number, since it is larger than the sum of its proper divisors (1).

51909287 is an equidigital number, since it uses as much as digits as its factorization.

51909287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 51909287 is about 7204.8099905549. The cubic root of 51909287 is about 373.0339462189.

The spelling of 51909287 in words is "fifty-one million, nine hundred nine thousand, two hundred eighty-seven".