1981083087 has 6 divisors (see below), whose sum is σ = 2861564472. Its totient is φ = 1320722052.

The previous prime is 1981083073. The next prime is 1981083121. The reversal of 1981083087 is 7803801891.

It is not a de Polignac number, because 1981083087 - 2²⁷ = 1846865359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981083007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 110060163 + ... + 110060180.

It is an arithmetic number, because the mean of its divisors is an integer number (476927412).

Almost surely, 2^1981083087 is an apocalyptic number.

1981083087 is a deficient number, since it is larger than the sum of its proper divisors (880481385).

1981083087 is a wasteful number, since it uses less digits than its factorization.

1981083087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220120349 (or 220120346 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 45.

The square root of 1981083087 is about 44509.3595438083. The cubic root of 1981083087 is about 1255.9361569017.

The spelling of 1981083087 in words is "one billion, nine hundred eighty-one million, eighty-three thousand, eighty-seven".