11656649 has 2 divisors, whose sum is σ = 11656650. Its totient is φ = 11656648.

The previous prime is 11656639. The next prime is 11656663. The reversal of 11656649 is 94665611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9966649 + 1690000 = 3157^2 + 1300^2 .

It is an emirp because it is prime and its reverse (94665611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11656649 - 2¹⁶ = 11591113 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (11656639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5828324 + 5828325.

It is an arithmetic number, because the mean of its divisors is an integer number (5828325).

Almost surely, 2^11656649 is an apocalyptic number.

It is an amenable number.

11656649 is a deficient number, since it is larger than the sum of its proper divisors (1).

11656649 is an equidigital number, since it uses as much as digits as its factorization.

11656649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 38.

The square root of 11656649 is about 3414.1835041485. The cubic root of 11656649 is about 226.7381365841.

It can be divided in two parts, 116 and 56649, that added together give a palindrome (56765).

The spelling of 11656649 in words is "eleven million, six hundred fifty-six thousand, six hundred forty-nine".