1012102781 has 2 divisors, whose sum is σ = 1012102782. Its totient is φ = 1012102780.

The previous prime is 1012102771. The next prime is 1012102829. The reversal of 1012102781 is 1872012101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1003305625 + 8797156 = 31675^2 + 2966^2 .

It is an emirp because it is prime and its reverse (1872012101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1012102781 - 2¹⁸ = 1011840637 is a prime.

It is a super-2 number, since 2×1012102781² = 2048704078615867922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012102771) 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, 506051390 + 506051391.

It is an arithmetic number, because the mean of its divisors is an integer number (506051391).

Almost surely, 2^1012102781 is an apocalyptic number.

It is an amenable number.

1012102781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012102781 is an equidigital number, since it uses as much as digits as its factorization.

1012102781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 23.

The square root of 1012102781 is about 31813.5628466854. The cubic root of 1012102781 is about 1004.0180936327.

Adding to 1012102781 its reverse (1872012101), we get a palindrome (2884114882).

The spelling of 1012102781 in words is "one billion, twelve million, one hundred two thousand, seven hundred eighty-one".