1090543981 has 2 divisors, whose sum is σ = 1090543982. Its totient is φ = 1090543980.

The previous prime is 1090543943. The next prime is 1090543997. The reversal of 1090543981 is 1893450901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1073610756 + 16933225 = 32766^2 + 4115^2 .

It is an emirp because it is prime and its reverse (1893450901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1090543981 - 2¹⁷ = 1090412909 is a prime.

It is a super-2 number, since 2×1090543981² = 2378572348990656722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1090543381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545271990 + 545271991.

It is an arithmetic number, because the mean of its divisors is an integer number (545271991).

Almost surely, 2^1090543981 is an apocalyptic number.

It is an amenable number.

1090543981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1090543981 is an equidigital number, since it uses as much as digits as its factorization.

1090543981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 1090543981 is about 33023.3853655254. The cubic root of 1090543981 is about 1029.3136411411.

The spelling of 1090543981 in words is "one billion, ninety million, five hundred forty-three thousand, nine hundred eighty-one".