51718691 has 2 divisors, whose sum is σ = 51718692. Its totient is φ = 51718690.

The previous prime is 51718679. The next prime is 51718721. The reversal of 51718691 is 19681715.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51718691 - 2¹⁴ = 51702307 is a prime.

It is not a weakly prime, because it can be changed into another prime (51718621) 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, 25859345 + 25859346.

It is an arithmetic number, because the mean of its divisors is an integer number (25859346).

Almost surely, 2^51718691 is an apocalyptic number.

51718691 is a deficient number, since it is larger than the sum of its proper divisors (1).

51718691 is an equidigital number, since it uses as much as digits as its factorization.

51718691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 38.

The square root of 51718691 is about 7191.5708297979. The cubic root of 51718691 is about 372.5768284393.

The spelling of 51718691 in words is "fifty-one million, seven hundred eighteen thousand, six hundred ninety-one".