8087991 has 4 divisors (see below), whose sum is σ = 10783992. Its totient is φ = 5391992.

The previous prime is 8087983. The next prime is 8088001. The reversal of 8087991 is 1997808.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8087991 - 2³ = 8087983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8087921) 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, 1347996 + ... + 1348001.

It is an arithmetic number, because the mean of its divisors is an integer number (2695998).

Almost surely, 2^8087991 is an apocalyptic number.

8087991 is a deficient number, since it is larger than the sum of its proper divisors (2696001).

8087991 is a wasteful number, since it uses less digits than its factorization.

8087991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2696000.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 8087991 is about 2843.9393453448. The cubic root of 8087991 is about 200.7305863020.

The spelling of 8087991 in words is "eight million, eighty-seven thousand, nine hundred ninety-one".