11777921 has 2 divisors, whose sum is σ = 11777922. Its totient is φ = 11777920.

The previous prime is 11777903. The next prime is 11777959. The reversal of 11777921 is 12977711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10817521 + 960400 = 3289^2 + 980^2 .

It is a cyclic number.

It is not a de Polignac number, because 11777921 - 2²² = 7583617 is a prime.

It is not a weakly prime, because it can be changed into another prime (11777971) 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, 5888960 + 5888961.

It is an arithmetic number, because the mean of its divisors is an integer number (5888961).

Almost surely, 2^11777921 is an apocalyptic number.

It is an amenable number.

11777921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11777921 is an equidigital number, since it uses as much as digits as its factorization.

11777921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6174, while the sum is 35.

The square root of 11777921 is about 3431.8975800568. The cubic root of 11777921 is about 227.5217287945.

The spelling of 11777921 in words is "eleven million, seven hundred seventy-seven thousand, nine hundred twenty-one".