51311329 has 2 divisors, whose sum is σ = 51311330. Its totient is φ = 51311328.

The previous prime is 51311327. The next prime is 51311339. The reversal of 51311329 is 92311315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29408929 + 21902400 = 5423^2 + 4680^2 .

It is a cyclic number.

It is not a de Polignac number, because 51311329 - 2¹ = 51311327 is a prime.

Together with 51311327, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51311327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25655664 + 25655665.

It is an arithmetic number, because the mean of its divisors is an integer number (25655665).

Almost surely, 2^51311329 is an apocalyptic number.

It is an amenable number.

51311329 is a deficient number, since it is larger than the sum of its proper divisors (1).

51311329 is an equidigital number, since it uses as much as digits as its factorization.

51311329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 810, while the sum is 25.

The square root of 51311329 is about 7163.1926541173. The cubic root of 51311329 is about 371.5960490642.

The spelling of 51311329 in words is "fifty-one million, three hundred eleven thousand, three hundred twenty-nine".