8311681 has 4 divisors (see below), whose sum is σ = 9499072. Its totient is φ = 7124292.

The previous prime is 8311663. The next prime is 8311687. The reversal of 8311681 is 1861138.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1861138 = 2 ⋅930569.

It is not a de Polignac number, because 8311681 - 2⁵ = 8311649 is a prime.

It is a super-2 number, since 2×8311681² = 138168082091522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8311687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 593685 + ... + 593698.

It is an arithmetic number, because the mean of its divisors is an integer number (2374768).

Almost surely, 2^8311681 is an apocalyptic number.

8311681 is the 1665-th hex number.

It is an amenable number.

8311681 is a deficient number, since it is larger than the sum of its proper divisors (1187391).

8311681 is a wasteful number, since it uses less digits than its factorization.

8311681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187390.

The product of its digits is 1152, while the sum is 28.

The square root of 8311681 is about 2882.9986125560. The cubic root of 8311681 is about 202.5643224003.

The spelling of 8311681 in words is "eight million, three hundred eleven thousand, six hundred eighty-one".