51581323 has 2 divisors, whose sum is σ = 51581324. Its totient is φ = 51581322.

The previous prime is 51581317. The next prime is 51581339. The reversal of 51581323 is 32318515.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51581323 - 2⁹ = 51580811 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51581291 and 51581300.

It is not a weakly prime, because it can be changed into another prime (51581353) 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, 25790661 + 25790662.

It is an arithmetic number, because the mean of its divisors is an integer number (25790662).

Almost surely, 2^51581323 is an apocalyptic number.

51581323 is a deficient number, since it is larger than the sum of its proper divisors (1).

51581323 is an equidigital number, since it uses as much as digits as its factorization.

51581323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 28.

The square root of 51581323 is about 7182.0138540663. The cubic root of 51581323 is about 372.2466736972.

Adding to 51581323 its reverse (32318515), we get a palindrome (83899838).

The spelling of 51581323 in words is "fifty-one million, five hundred eighty-one thousand, three hundred twenty-three".