1081109921 has 2 divisors, whose sum is σ = 1081109922. Its totient is φ = 1081109920.

The previous prime is 1081109837. The next prime is 1081109927. The reversal of 1081109921 is 1299011801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1078202896 + 2907025 = 32836^2 + 1705^2 .

It is an emirp because it is prime and its reverse (1299011801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1081109921 - 2²² = 1076915617 is a prime.

It is a super-2 number, since 2×1081109921² = 2337597322569252482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1081109927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540554960 + 540554961.

It is an arithmetic number, because the mean of its divisors is an integer number (540554961).

Almost surely, 2^1081109921 is an apocalyptic number.

It is an amenable number.

1081109921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081109921 is an equidigital number, since it uses as much as digits as its factorization.

1081109921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 32.

The square root of 1081109921 is about 32880.2360240920. The cubic root of 1081109921 is about 1026.3369177116.

The spelling of 1081109921 in words is "one billion, eighty-one million, one hundred nine thousand, nine hundred twenty-one".