53936749981 has 2 divisors, whose sum is σ = 53936749982. Its totient is φ = 53936749980.

The previous prime is 53936749939. The next prime is 53936750029. The reversal of 53936749981 is 18994763935.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52090758756 + 1845991225 = 228234^2 + 42965^2 .

It is a cyclic number.

It is not a de Polignac number, because 53936749981 - 2⁹ = 53936749469 is a prime.

It is a super-2 number, since 2×53936749981² (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 (53936740981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26968374990 + 26968374991.

It is an arithmetic number, because the mean of its divisors is an integer number (26968374991).

Almost surely, 2^53936749981 is an apocalyptic number.

It is an amenable number.

53936749981 is a deficient number, since it is larger than the sum of its proper divisors (1).

53936749981 is an equidigital number, since it uses as much as digits as its factorization.

53936749981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44089920, while the sum is 64.

The spelling of 53936749981 in words is "fifty-three billion, nine hundred thirty-six million, seven hundred forty-nine thousand, nine hundred eighty-one".