51539959 has 2 divisors, whose sum is σ = 51539960. Its totient is φ = 51539958.

The previous prime is 51539923. The next prime is 51539963. The reversal of 51539959 is 95993515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51539959 - 2¹⁵ = 51507191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51539909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25769979 + 25769980.

It is an arithmetic number, because the mean of its divisors is an integer number (25769980).

Almost surely, 2^51539959 is an apocalyptic number.

51539959 is a deficient number, since it is larger than the sum of its proper divisors (1).

51539959 is an equidigital number, since it uses as much as digits as its factorization.

51539959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 273375, while the sum is 46.

The square root of 51539959 is about 7179.1335828218. The cubic root of 51539959 is about 372.1471432972.

The spelling of 51539959 in words is "fifty-one million, five hundred thirty-nine thousand, nine hundred fifty-nine".