11948581 has 2 divisors, whose sum is σ = 11948582. Its totient is φ = 11948580.

The previous prime is 11948537. The next prime is 11948593. The reversal of 11948581 is 18584911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8208225 + 3740356 = 2865^2 + 1934^2 .

It is a cyclic number.

It is not a de Polignac number, because 11948581 - 2¹¹ = 11946533 is a prime.

It is a super-2 number, since 2×11948581² = 285537175827122, 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 11948581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11948381) 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, 5974290 + 5974291.

It is an arithmetic number, because the mean of its divisors is an integer number (5974291).

Almost surely, 2^11948581 is an apocalyptic number.

It is an amenable number.

11948581 is a deficient number, since it is larger than the sum of its proper divisors (1).

11948581 is an equidigital number, since it uses as much as digits as its factorization.

11948581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 37.

The square root of 11948581 is about 3456.6719543515. The cubic root of 11948581 is about 228.6153799968.

The spelling of 11948581 in words is "eleven million, nine hundred forty-eight thousand, five hundred eighty-one".