53857729 has 2 divisors, whose sum is σ = 53857730. Its totient is φ = 53857728.

The previous prime is 53857711. The next prime is 53857747. The reversal of 53857729 is 92775835.

It is a balanced prime because it is at equal distance from previous prime (53857711) and next prime (53857747).

It can be written as a sum of positive squares in only one way, i.e., 52998400 + 859329 = 7280^2 + 927^2 .

It is a cyclic number.

It is not a de Polignac number, because 53857729 - 2⁹ = 53857217 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (53855729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26928864 + 26928865.

It is an arithmetic number, because the mean of its divisors is an integer number (26928865).

Almost surely, 2^53857729 is an apocalyptic number.

It is an amenable number.

53857729 is a deficient number, since it is larger than the sum of its proper divisors (1).

53857729 is an equidigital number, since it uses as much as digits as its factorization.

53857729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 529200, while the sum is 46.

The square root of 53857729 is about 7338.7825284580. The cubic root of 53857729 is about 377.6440781556.

The spelling of 53857729 in words is "fifty-three million, eight hundred fifty-seven thousand, seven hundred twenty-nine".