1081002781 has 2 divisors, whose sum is σ = 1081002782. Its totient is φ = 1081002780.

The previous prime is 1081002751. The next prime is 1081002803. The reversal of 1081002781 is 1872001801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 765407556 + 315595225 = 27666^2 + 17765^2 .

It is a cyclic number.

It is not a de Polignac number, because 1081002781 - 2¹¹ = 1081000733 is a prime.

It is a super-2 number, since 2×1081002781² = 2337134025059467922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1081002731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540501390 + 540501391.

It is an arithmetic number, because the mean of its divisors is an integer number (540501391).

Almost surely, 2^1081002781 is an apocalyptic number.

It is an amenable number.

1081002781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081002781 is an equidigital number, since it uses as much as digits as its factorization.

1081002781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 1081002781 is about 32878.6067375125. The cubic root of 1081002781 is about 1026.3030126270.

The spelling of 1081002781 in words is "one billion, eighty-one million, two thousand, seven hundred eighty-one".