54638729 has 2 divisors, whose sum is σ = 54638730. Its totient is φ = 54638728.

The previous prime is 54638693. The next prime is 54638743. The reversal of 54638729 is 92783645.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53071225 + 1567504 = 7285^2 + 1252^2 .

It is a cyclic number.

It is not a de Polignac number, because 54638729 - 2²⁴ = 37861513 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 54638729.

It is not a weakly prime, because it can be changed into another prime (54638789) 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, 27319364 + 27319365.

It is an arithmetic number, because the mean of its divisors is an integer number (27319365).

Almost surely, 2^54638729 is an apocalyptic number.

It is an amenable number.

54638729 is a deficient number, since it is larger than the sum of its proper divisors (1).

54638729 is an equidigital number, since it uses as much as digits as its factorization.

54638729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 44.

The square root of 54638729 is about 7391.8014719011. The cubic root of 54638729 is about 379.4607517491.

The spelling of 54638729 in words is "fifty-four million, six hundred thirty-eight thousand, seven hundred twenty-nine".