8065991 has 4 divisors (see below), whose sum is σ = 8101752. Its totient is φ = 8030232.

The previous prime is 8065987. The next prime is 8066027. The reversal of 8065991 is 1995608.

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 8065991 - 2² = 8065987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8065901) 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, 17540 + ... + 17993.

It is an arithmetic number, because the mean of its divisors is an integer number (2025438).

Almost surely, 2^8065991 is an apocalyptic number.

8065991 is a deficient number, since it is larger than the sum of its proper divisors (35761).

8065991 is a wasteful number, since it uses less digits than its factorization.

8065991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35760.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 8065991 is about 2840.0688371939. The cubic root of 8065991 is about 200.5484198041.

The spelling of 8065991 in words is "eight million, sixty-five thousand, nine hundred ninety-one".