51493261 has 2 divisors, whose sum is σ = 51493262. Its totient is φ = 51493260.

The previous prime is 51493259. The next prime is 51493271. The reversal of 51493261 is 16239415.

51493261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42902500 + 8590761 = 6550^2 + 2931^2 .

It is a cyclic number.

It is not a de Polignac number, because 51493261 - 2¹ = 51493259 is a prime.

Together with 51493259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51493271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25746630 + 25746631.

It is an arithmetic number, because the mean of its divisors is an integer number (25746631).

Almost surely, 2^51493261 is an apocalyptic number.

It is an amenable number.

51493261 is a deficient number, since it is larger than the sum of its proper divisors (1).

51493261 is an equidigital number, since it uses as much as digits as its factorization.

51493261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 51493261 is about 7175.8805034644. The cubic root of 51493261 is about 372.0347141652.

The spelling of 51493261 in words is "fifty-one million, four hundred ninety-three thousand, two hundred sixty-one".