51022561 has 2 divisors, whose sum is σ = 51022562. Its totient is φ = 51022560.

The previous prime is 51022549. The next prime is 51022583. The reversal of 51022561 is 16522015.

It is an a-pointer prime, because the next prime (51022583) can be obtained adding 51022561 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49434961 + 1587600 = 7031^2 + 1260^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51022561 is a prime.

It is not a weakly prime, because it can be changed into another prime (51022501) 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, 25511280 + 25511281.

It is an arithmetic number, because the mean of its divisors is an integer number (25511281).

Almost surely, 2^51022561 is an apocalyptic number.

It is an amenable number.

51022561 is a deficient number, since it is larger than the sum of its proper divisors (1).

51022561 is an equidigital number, since it uses as much as digits as its factorization.

51022561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 51022561 is about 7143.0078398389. The cubic root of 51022561 is about 370.8976524494.

Adding to 51022561 its reverse (16522015), we get a palindrome (67544576).

The spelling of 51022561 in words is "fifty-one million, twenty-two thousand, five hundred sixty-one".