51516433 has 2 divisors, whose sum is σ = 51516434. Its totient is φ = 51516432.

The previous prime is 51516431. The next prime is 51516449. The reversal of 51516433 is 33461515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51365889 + 150544 = 7167^2 + 388^2 .

It is a cyclic number.

It is not a de Polignac number, because 51516433 - 2¹ = 51516431 is a prime.

Together with 51516431, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51516431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25758216 + 25758217.

It is an arithmetic number, because the mean of its divisors is an integer number (25758217).

Almost surely, 2^51516433 is an apocalyptic number.

It is an amenable number.

51516433 is a deficient number, since it is larger than the sum of its proper divisors (1).

51516433 is an equidigital number, since it uses as much as digits as its factorization.

51516433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 28.

The square root of 51516433 is about 7177.4948972465. The cubic root of 51516433 is about 372.0905110820.

Adding to 51516433 its reverse (33461515), we get a palindrome (84977948).

The spelling of 51516433 in words is "fifty-one million, five hundred sixteen thousand, four hundred thirty-three".