51545729 has 2 divisors, whose sum is σ = 51545730. Its totient is φ = 51545728.

The previous prime is 51545707. The next prime is 51545761. The reversal of 51545729 is 92754515.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33466225 + 18079504 = 5785^2 + 4252^2 .

It is a cyclic number.

It is not a de Polignac number, because 51545729 - 2¹⁶ = 51480193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51545692 and 51545701.

It is not a weakly prime, because it can be changed into another prime (51545029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25772864 + 25772865.

It is an arithmetic number, because the mean of its divisors is an integer number (25772865).

Almost surely, 2^51545729 is an apocalyptic number.

It is an amenable number.

51545729 is a deficient number, since it is larger than the sum of its proper divisors (1).

51545729 is an equidigital number, since it uses as much as digits as its factorization.

51545729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63000, while the sum is 38.

The square root of 51545729 is about 7179.5354306529. The cubic root of 51545729 is about 372.1610303144.

The spelling of 51545729 in words is "fifty-one million, five hundred forty-five thousand, seven hundred twenty-nine".