51649291 has 2 divisors, whose sum is σ = 51649292. Its totient is φ = 51649290.

The previous prime is 51649289. The next prime is 51649313. The reversal of 51649291 is 19294615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51649291 - 2¹ = 51649289 is a prime.

Together with 51649289, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 51649291.

It is not a weakly prime, because it can be changed into another prime (51649231) 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, 25824645 + 25824646.

It is an arithmetic number, because the mean of its divisors is an integer number (25824646).

Almost surely, 2^51649291 is an apocalyptic number.

51649291 is a deficient number, since it is larger than the sum of its proper divisors (1).

51649291 is an equidigital number, since it uses as much as digits as its factorization.

51649291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 37.

The square root of 51649291 is about 7186.7441167750. The cubic root of 51649291 is about 372.4101033761.

The spelling of 51649291 in words is "fifty-one million, six hundred forty-nine thousand, two hundred ninety-one".