8465991 has 4 divisors (see below), whose sum is σ = 11287992. Its totient is φ = 5643992.

The previous prime is 8465971. The next prime is 8466013. The reversal of 8465991 is 1995648.

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 8465991 - 2⁵ = 8465959 is a prime.

It is a super-2 number, since 2×8465991² = 143346007224162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8465971) 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, 1410996 + ... + 1411001.

It is an arithmetic number, because the mean of its divisors is an integer number (2821998).

Almost surely, 2^8465991 is an apocalyptic number.

8465991 is a deficient number, since it is larger than the sum of its proper divisors (2822001).

8465991 is a wasteful number, since it uses less digits than its factorization.

8465991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2822000.

The product of its digits is 77760, while the sum is 42.

The square root of 8465991 is about 2909.6376063008. The cubic root of 8465991 is about 203.8102089116.

The spelling of 8465991 in words is "eight million, four hundred sixty-five thousand, nine hundred ninety-one".