912105781 has 2 divisors, whose sum is σ = 912105782. Its totient is φ = 912105780.

The previous prime is 912105769. The next prime is 912105791. The reversal of 912105781 is 187501219.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 464402500 + 447703281 = 21550^2 + 21159^2 .

It is an emirp because it is prime and its reverse (187501219) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 912105781 - 2⁹ = 912105269 is a prime.

It is a super-2 number, since 2×912105781² = 1663873911467239922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (912105791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 456052890 + 456052891.

It is an arithmetic number, because the mean of its divisors is an integer number (456052891).

Almost surely, 2^912105781 is an apocalyptic number.

It is an amenable number.

912105781 is a deficient number, since it is larger than the sum of its proper divisors (1).

912105781 is an equidigital number, since it uses as much as digits as its factorization.

912105781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 34.

The square root of 912105781 is about 30201.0890697670. The cubic root of 912105781 is about 969.7990092649.

The spelling of 912105781 in words is "nine hundred twelve million, one hundred five thousand, seven hundred eighty-one".