8461391 has 2 divisors, whose sum is σ = 8461392. Its totient is φ = 8461390.

The previous prime is 8461379. The next prime is 8461399. The reversal of 8461391 is 1931648.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8461391 - 2¹⁰ = 8460367 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8461399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4230695 + 4230696.

It is an arithmetic number, because the mean of its divisors is an integer number (4230696).

Almost surely, 2^8461391 is an apocalyptic number.

8461391 is a deficient number, since it is larger than the sum of its proper divisors (1).

8461391 is an equidigital number, since it uses as much as digits as its factorization.

8461391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 8461391 is about 2908.8470224472. The cubic root of 8461391 is about 203.7732887678.

The spelling of 8461391 in words is "eight million, four hundred sixty-one thousand, three hundred ninety-one".