8651891 has 2 divisors, whose sum is σ = 8651892. Its totient is φ = 8651890.

The previous prime is 8651869. The next prime is 8651893. The reversal of 8651891 is 1981568.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8651891 is a prime.

Together with 8651893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8651893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4325945 + 4325946.

It is an arithmetic number, because the mean of its divisors is an integer number (4325946).

Almost surely, 2^8651891 is an apocalyptic number.

8651891 is a deficient number, since it is larger than the sum of its proper divisors (1).

8651891 is an equidigital number, since it uses as much as digits as its factorization.

8651891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 38.

The square root of 8651891 is about 2941.4096960471. The cubic root of 8651891 is about 205.2912062079.

The spelling of 8651891 in words is "eight million, six hundred fifty-one thousand, eight hundred ninety-one".