51647329 has 2 divisors, whose sum is σ = 51647330. Its totient is φ = 51647328.

The previous prime is 51647327. The next prime is 51647353. The reversal of 51647329 is 92374615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51624225 + 23104 = 7185^2 + 152^2 .

It is a cyclic number.

It is not a de Polignac number, because 51647329 - 2¹ = 51647327 is a prime.

Together with 51647327, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51647327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25823664 + 25823665.

It is an arithmetic number, because the mean of its divisors is an integer number (25823665).

Almost surely, 2^51647329 is an apocalyptic number.

It is an amenable number.

51647329 is a deficient number, since it is larger than the sum of its proper divisors (1).

51647329 is an equidigital number, since it uses as much as digits as its factorization.

51647329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 37.

The square root of 51647329 is about 7186.6076141668. The cubic root of 51647329 is about 372.4053877395.

The spelling of 51647329 in words is "fifty-one million, six hundred forty-seven thousand, three hundred twenty-nine".