51061291 has 2 divisors, whose sum is σ = 51061292. Its totient is φ = 51061290.

The previous prime is 51061289. The next prime is 51061321. The reversal of 51061291 is 19216015.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51061291 - 2¹ = 51061289 is a prime.

Together with 51061289, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51061271) 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, 25530645 + 25530646.

It is an arithmetic number, because the mean of its divisors is an integer number (25530646).

Almost surely, 2^51061291 is an apocalyptic number.

51061291 is a deficient number, since it is larger than the sum of its proper divisors (1).

51061291 is an equidigital number, since it uses as much as digits as its factorization.

51061291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 51061291 is about 7145.7183683658. The cubic root of 51061291 is about 370.9914752124.

The spelling of 51061291 in words is "fifty-one million, sixty-one thousand, two hundred ninety-one".