8391651 has 4 divisors (see below), whose sum is σ = 11188872. Its totient is φ = 5594432.

The previous prime is 8391641. The next prime is 8391653. The reversal of 8391651 is 1561938.

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 8391651 - 2¹¹ = 8389603 is a prime.

8391651 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8391653) 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, 1398606 + ... + 1398611.

It is an arithmetic number, because the mean of its divisors is an integer number (2797218).

Almost surely, 2^8391651 is an apocalyptic number.

8391651 is a deficient number, since it is larger than the sum of its proper divisors (2797221).

8391651 is a wasteful number, since it uses less digits than its factorization.

8391651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2797220.

The product of its digits is 6480, while the sum is 33.

The square root of 8391651 is about 2896.8346518226. The cubic root of 8391651 is about 203.2119006789.

The spelling of 8391651 in words is "eight million, three hundred ninety-one thousand, six hundred fifty-one".