11681959 has 2 divisors, whose sum is σ = 11681960. Its totient is φ = 11681958.

The previous prime is 11681933. The next prime is 11681981. The reversal of 11681959 is 95918611.

It is a strong prime.

It is an emirp because it is prime and its reverse (95918611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11681959 - 2²¹ = 9584807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11681909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5840979 + 5840980.

It is an arithmetic number, because the mean of its divisors is an integer number (5840980).

Almost surely, 2^11681959 is an apocalyptic number.

11681959 is a deficient number, since it is larger than the sum of its proper divisors (1).

11681959 is an equidigital number, since it uses as much as digits as its factorization.

11681959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 40.

The square root of 11681959 is about 3417.8880906197. Note that the first 3 decimals coincide. The cubic root of 11681959 is about 226.9021229276.

The spelling of 11681959 in words is "eleven million, six hundred eighty-one thousand, nine hundred fifty-nine".