1981035611 has 4 divisors (see below), whose sum is σ = 2034577152. Its totient is φ = 1927494072.

The previous prime is 1981035607. The next prime is 1981035631. The reversal of 1981035611 is 1165301891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1165301891 = 13 ⋅89638607.

It is a cyclic number.

It is not a de Polignac number, because 1981035611 - 2² = 1981035607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1981035631) 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, 26770715 + ... + 26770788.

It is an arithmetic number, because the mean of its divisors is an integer number (508644288).

Almost surely, 2^1981035611 is an apocalyptic number.

1981035611 is a deficient number, since it is larger than the sum of its proper divisors (53541541).

1981035611 is an equidigital number, since it uses as much as digits as its factorization.

1981035611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53541540.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 1981035611 is about 44508.8262145836. The cubic root of 1981035611 is about 1255.9261241235.

The spelling of 1981035611 in words is "one billion, nine hundred eighty-one million, thirty-five thousand, six hundred eleven".