52856729381 has 2 divisors, whose sum is σ = 52856729382. Its totient is φ = 52856729380.

The previous prime is 52856729357. The next prime is 52856729437. The reversal of 52856729381 is 18392765825.

It is a happy number.

It is an a-pointer prime, because the next prime (52856729437) can be obtained adding 52856729381 to its sum of digits (56).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50090916100 + 2765813281 = 223810^2 + 52591^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52856729381 is a prime.

It is a super-2 number, since 2×52856729381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52856729311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26428364690 + 26428364691.

It is an arithmetic number, because the mean of its divisors is an integer number (26428364691).

Almost surely, 2^52856729381 is an apocalyptic number.

It is an amenable number.

52856729381 is a deficient number, since it is larger than the sum of its proper divisors (1).

52856729381 is an equidigital number, since it uses as much as digits as its factorization.

52856729381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7257600, while the sum is 56.

The spelling of 52856729381 in words is "fifty-two billion, eight hundred fifty-six million, seven hundred twenty-nine thousand, three hundred eighty-one".