51530887 has 2 divisors, whose sum is σ = 51530888. Its totient is φ = 51530886.

The previous prime is 51530867. The next prime is 51530917. The reversal of 51530887 is 78803515.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51530887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51530867) 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, 25765443 + 25765444.

It is an arithmetic number, because the mean of its divisors is an integer number (25765444).

Almost surely, 2^51530887 is an apocalyptic number.

51530887 is a deficient number, since it is larger than the sum of its proper divisors (1).

51530887 is an equidigital number, since it uses as much as digits as its factorization.

51530887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 51530887 is about 7178.5017238975. The cubic root of 51530887 is about 372.1253070556.

The spelling of 51530887 in words is "fifty-one million, five hundred thirty thousand, eight hundred eighty-seven".