11889961 has 2 divisors, whose sum is σ = 11889962. Its totient is φ = 11889960.

The previous prime is 11889949. The next prime is 11889979. The reversal of 11889961 is 16998811.

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., 11594025 + 295936 = 3405^2 + 544^2 .It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 19668811 and 11886691.

It is a cyclic number.

It is not a de Polignac number, because 11889961 - 2¹³ = 11881769 is a prime.

It is not a weakly prime, because it can be changed into another prime (11889901) 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, 5944980 + 5944981.

It is an arithmetic number, because the mean of its divisors is an integer number (5944981).

Almost surely, 2^11889961 is an apocalyptic number.

It is an amenable number.

11889961 is a deficient number, since it is larger than the sum of its proper divisors (1).

11889961 is an equidigital number, since it uses as much as digits as its factorization.

11889961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 43.

The square root of 11889961 is about 3448.1822747645. The cubic root of 11889961 is about 228.2409029100.

The spelling of 11889961 in words is "eleven million, eight hundred eighty-nine thousand, nine hundred sixty-one".