9181261 has 2 divisors, whose sum is σ = 9181262. Its totient is φ = 9181260.

The previous prime is 9181247. The next prime is 9181279. The reversal of 9181261 is 1621819.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9180900 + 361 = 3030^2 + 19^2 .

It is an emirp because it is prime and its reverse (1621819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9181261 - 2¹¹ = 9179213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9181201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4590630 + 4590631.

It is an arithmetic number, because the mean of its divisors is an integer number (4590631).

Almost surely, 2^9181261 is an apocalyptic number.

It is an amenable number.

9181261 is a deficient number, since it is larger than the sum of its proper divisors (1).

9181261 is an equidigital number, since it uses as much as digits as its factorization.

9181261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 28.

The square root of 9181261 is about 3030.0595703715. The cubic root of 9181261 is about 209.3955483212.

The spelling of 9181261 in words is "nine million, one hundred eighty-one thousand, two hundred sixty-one".