51489539 has 2 divisors, whose sum is σ = 51489540. Its totient is φ = 51489538.

The previous prime is 51489527. The next prime is 51489623. The reversal of 51489539 is 93598415.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51489539 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51489539.

It is not a weakly prime, because it can be changed into another prime (51489509) 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, 25744769 + 25744770.

It is an arithmetic number, because the mean of its divisors is an integer number (25744770).

Almost surely, 2^51489539 is an apocalyptic number.

51489539 is a deficient number, since it is larger than the sum of its proper divisors (1).

51489539 is an equidigital number, since it uses as much as digits as its factorization.

51489539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 44.

The square root of 51489539 is about 7175.6211577814. The cubic root of 51489539 is about 372.0257502312.

The spelling of 51489539 in words is "fifty-one million, four hundred eighty-nine thousand, five hundred thirty-nine".