108512647781 has 2 divisors, whose sum is σ = 108512647782. Its totient is φ = 108512647780.

The previous prime is 108512647777. The next prime is 108512647819. The reversal of 108512647781 is 187746215801.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84192245281 + 24320402500 = 290159^2 + 155950^2 .

It is a cyclic number.

It is not a de Polignac number, because 108512647781 - 2² = 108512647777 is a prime.

It is a super-2 number, since 2×108512647781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108512647741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54256323890 + 54256323891.

It is an arithmetic number, because the mean of its divisors is an integer number (54256323891).

Almost surely, 2^108512647781 is an apocalyptic number.

It is an amenable number.

108512647781 is a deficient number, since it is larger than the sum of its proper divisors (1).

108512647781 is an equidigital number, since it uses as much as digits as its factorization.

108512647781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 752640, while the sum is 50.

The spelling of 108512647781 in words is "one hundred eight billion, five hundred twelve million, six hundred forty-seven thousand, seven hundred eighty-one".