8506391 has 2 divisors, whose sum is σ = 8506392. Its totient is φ = 8506390.

The previous prime is 8506373. The next prime is 8506403. The reversal of 8506391 is 1936058.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8506391 - 2⁶ = 8506327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8506331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4253195 + 4253196.

It is an arithmetic number, because the mean of its divisors is an integer number (4253196).

Almost surely, 2^8506391 is an apocalyptic number.

8506391 is a deficient number, since it is larger than the sum of its proper divisors (1).

8506391 is an equidigital number, since it uses as much as digits as its factorization.

8506391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 8506391 is about 2916.5717889330. The cubic root of 8506391 is about 204.1338910226.

The spelling of 8506391 in words is "eight million, five hundred six thousand, three hundred ninety-one".