1987334091 has 12 divisors (see below), whose sum is σ = 2911025520. Its totient is φ = 1306228560.

The previous prime is 1987334039. The next prime is 1987334099. The reversal of 1987334091 is 1904337891.

It is not a de Polignac number, because 1987334091 - 2¹⁰ = 1987333067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1987334099) 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 11 ways as a sum of consecutive naturals, for example, 1554396 + ... + 1555673.

It is an arithmetic number, because the mean of its divisors is an integer number (242585460).

Almost surely, 2^1987334091 is an apocalyptic number.

1987334091 is a deficient number, since it is larger than the sum of its proper divisors (923691429).

1987334091 is a wasteful number, since it uses less digits than its factorization.

1987334091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3110146 (or 3110143 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 1987334091 is about 44579.5254685377. The cubic root of 1987334091 is about 1257.2557412980.

The spelling of 1987334091 in words is "one billion, nine hundred eighty-seven million, three hundred thirty-four thousand, ninety-one".