8251591 has 2 divisors, whose sum is σ = 8251592. Its totient is φ = 8251590.

The previous prime is 8251583. The next prime is 8251597. The reversal of 8251591 is 1951528.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8251591 - 2³ = 8251583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8251597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4125795 + 4125796.

It is an arithmetic number, because the mean of its divisors is an integer number (4125796).

Almost surely, 2^8251591 is an apocalyptic number.

8251591 is a deficient number, since it is larger than the sum of its proper divisors (1).

8251591 is an equidigital number, since it uses as much as digits as its factorization.

8251591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 31.

The square root of 8251591 is about 2872.5582674682. The cubic root of 8251591 is about 202.0749893131.

The spelling of 8251591 in words is "eight million, two hundred fifty-one thousand, five hundred ninety-one".