8951581 has 2 divisors, whose sum is σ = 8951582. Its totient is φ = 8951580.

The previous prime is 8951563. The next prime is 8951587. The reversal of 8951581 is 1851598.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7338681 + 1612900 = 2709^2 + 1270^2 .

It is a cyclic number.

It is not a de Polignac number, because 8951581 - 2⁵ = 8951549 is a prime.

It is a super-2 number, since 2×8951581² = 160261604799122, 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 8951581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8951587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4475790 + 4475791.

It is an arithmetic number, because the mean of its divisors is an integer number (4475791).

Almost surely, 2^8951581 is an apocalyptic number.

It is an amenable number.

8951581 is a deficient number, since it is larger than the sum of its proper divisors (1).

8951581 is an equidigital number, since it uses as much as digits as its factorization.

8951581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 37.

The square root of 8951581 is about 2991.9192836706. The cubic root of 8951581 is about 207.6346907005.

The spelling of 8951581 in words is "eight million, nine hundred fifty-one thousand, five hundred eighty-one".