1020112981 has 2 divisors, whose sum is σ = 1020112982. Its totient is φ = 1020112980.

The previous prime is 1020112979. The next prime is 1020113047. The reversal of 1020112981 is 1892110201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 551780100 + 468332881 = 23490^2 + 21641^2 .

It is an emirp because it is prime and its reverse (1892110201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1020112981 - 2¹ = 1020112979 is a prime.

It is a super-2 number, since 2×1020112981² = 2081260988009412722, which contains 22 as substring.

Together with 1020112979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020112901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510056490 + 510056491.

It is an arithmetic number, because the mean of its divisors is an integer number (510056491).

Almost surely, 2^1020112981 is an apocalyptic number.

It is an amenable number.

1020112981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020112981 is an equidigital number, since it uses as much as digits as its factorization.

1020112981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 1020112981 is about 31939.2075825309. The cubic root of 1020112981 is about 1006.6598746064.

It can be divided in two parts, 102011 and 2981, that multiplied together give a triangular number (304094791 = T₂₄₆₆₁).

The spelling of 1020112981 in words is "one billion, twenty million, one hundred twelve thousand, nine hundred eighty-one".