38540512861 has 2 divisors, whose sum is σ = 38540512862. Its totient is φ = 38540512860.

The previous prime is 38540512841. The next prime is 38540512921. The reversal of 38540512861 is 16821504583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21850456761 + 16690056100 = 147819^2 + 129190^2 .

It is a cyclic number.

It is not a de Polignac number, because 38540512861 - 2¹⁵ = 38540480093 is a prime.

It is a super-2 number, since 2×38540512861² (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 (38540512831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19270256430 + 19270256431.

It is an arithmetic number, because the mean of its divisors is an integer number (19270256431).

Almost surely, 2^38540512861 is an apocalyptic number.

It is an amenable number.

38540512861 is a deficient number, since it is larger than the sum of its proper divisors (1).

38540512861 is an equidigital number, since it uses as much as digits as its factorization.

38540512861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 230400, while the sum is 43.

The spelling of 38540512861 in words is "thirty-eight billion, five hundred forty million, five hundred twelve thousand, eight hundred sixty-one".