9671581 has 2 divisors, whose sum is σ = 9671582. Its totient is φ = 9671580.

The previous prime is 9671573. The next prime is 9671591. The reversal of 9671581 is 1851769.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6812100 + 2859481 = 2610^2 + 1691^2 .

It is an emirp because it is prime and its reverse (1851769) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9671581 - 2³ = 9671573 is a prime.

It is a super-2 number, since 2×9671581² = 187078958079122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9671581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9671561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4835790 + 4835791.

It is an arithmetic number, because the mean of its divisors is an integer number (4835791).

Almost surely, 2^9671581 is an apocalyptic number.

It is an amenable number.

9671581 is a deficient number, since it is larger than the sum of its proper divisors (1).

9671581 is an equidigital number, since it uses as much as digits as its factorization.

9671581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 37.

The square root of 9671581 is about 3109.9165583662. The cubic root of 9671581 is about 213.0586435836.

The spelling of 9671581 in words is "nine million, six hundred seventy-one thousand, five hundred eighty-one".