8158561 has 2 divisors, whose sum is σ = 8158562. Its totient is φ = 8158560.

The previous prime is 8158547. The next prime is 8158603. The reversal of 8158561 is 1658518.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8088336 + 70225 = 2844^2 + 265^2 .

It is a cyclic number.

It is not a de Polignac number, because 8158561 - 2⁵ = 8158529 is a prime.

It is not a weakly prime, because it can be changed into another prime (8158511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4079280 + 4079281.

It is an arithmetic number, because the mean of its divisors is an integer number (4079281).

Almost surely, 2^8158561 is an apocalyptic number.

It is an amenable number.

8158561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8158561 is an equidigital number, since it uses as much as digits as its factorization.

8158561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9600, while the sum is 34.

The square root of 8158561 is about 2856.3194849316. The cubic root of 8158561 is about 201.3127068202.

The spelling of 8158561 in words is "eight million, one hundred fifty-eight thousand, five hundred sixty-one".