51581393 has 2 divisors, whose sum is σ = 51581394. Its totient is φ = 51581392.

The previous prime is 51581363. The next prime is 51581423. The reversal of 51581393 is 39318515.

It is a balanced prime because it is at equal distance from previous prime (51581363) and next prime (51581423).

It can be written as a sum of positive squares in only one way, i.e., 29463184 + 22118209 = 5428^2 + 4703^2 .

It is a cyclic number.

It is not a de Polignac number, because 51581393 - 2¹⁰ = 51580369 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51581323) 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, 25790696 + 25790697.

It is an arithmetic number, because the mean of its divisors is an integer number (25790697).

Almost surely, 2^51581393 is an apocalyptic number.

It is an amenable number.

51581393 is a deficient number, since it is larger than the sum of its proper divisors (1).

51581393 is an equidigital number, since it uses as much as digits as its factorization.

51581393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 35.

The square root of 51581393 is about 7182.0187273496. The cubic root of 51581393 is about 372.2468420866.

The spelling of 51581393 in words is "fifty-one million, five hundred eighty-one thousand, three hundred ninety-three".