51581297 has 2 divisors, whose sum is σ = 51581298. Its totient is φ = 51581296.

The previous prime is 51581279. The next prime is 51581317. The reversal of 51581297 is 79218515.

Together with previous prime (51581279) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50751376 + 829921 = 7124^2 + 911^2 .

It is a cyclic number.

It is not a de Polignac number, because 51581297 - 2¹⁰ = 51580273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51581297.

It is not a weakly prime, because it can be changed into another prime (51583297) 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, 25790648 + 25790649.

It is an arithmetic number, because the mean of its divisors is an integer number (25790649).

Almost surely, 2^51581297 is an apocalyptic number.

It is an amenable number.

51581297 is a deficient number, since it is larger than the sum of its proper divisors (1).

51581297 is an equidigital number, since it uses as much as digits as its factorization.

51581297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 38.

The square root of 51581297 is about 7182.0120439888. The cubic root of 51581297 is about 372.2466111525.

The spelling of 51581297 in words is "fifty-one million, five hundred eighty-one thousand, two hundred ninety-seven".