51982561 has 2 divisors, whose sum is σ = 51982562. Its totient is φ = 51982560.

The previous prime is 51982531. The next prime is 51982573. The reversal of 51982561 is 16528915.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39450961 + 12531600 = 6281^2 + 3540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51982561 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 51982561.

It is not a weakly prime, because it can be changed into another prime (51982501) 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, 25991280 + 25991281.

It is an arithmetic number, because the mean of its divisors is an integer number (25991281).

Almost surely, 2^51982561 is an apocalyptic number.

It is an amenable number.

51982561 is a deficient number, since it is larger than the sum of its proper divisors (1).

51982561 is an equidigital number, since it uses as much as digits as its factorization.

51982561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 37.

The square root of 51982561 is about 7209.8932724417. The cubic root of 51982561 is about 373.2093858485.

The spelling of 51982561 in words is "fifty-one million, nine hundred eighty-two thousand, five hundred sixty-one".