1105099981 has 4 divisors (see below), whose sum is σ = 1105235964. Its totient is φ = 1104964000.

The previous prime is 1105099969. The next prime is 1105099991. The reversal of 1105099981 is 1899905011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1899905011 = 7187 ⋅264353.

It can be written as a sum of positive squares in 2 ways, for example, as 716418756 + 388681225 = 26766^2 + 19715^2 .

It is a cyclic number.

It is not a de Polignac number, because 1105099981 - 2¹³ = 1105091789 is a prime.

It is a super-2 number, since 2×1105099981² = 2442491936012400722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1105099991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54970 + ... + 72331.

It is an arithmetic number, because the mean of its divisors is an integer number (276308991).

Almost surely, 2^1105099981 is an apocalyptic number.

It is an amenable number.

1105099981 is a deficient number, since it is larger than the sum of its proper divisors (135983).

1105099981 is an equidigital number, since it uses as much as digits as its factorization.

1105099981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135982.

The product of its (nonzero) digits is 29160, while the sum is 43.

The square root of 1105099981 is about 33243.0440994804. The cubic root of 1105099981 is about 1033.8729923304.

The spelling of 1105099981 in words is "one billion, one hundred five million, ninety-nine thousand, nine hundred eighty-one".