11671409 has 2 divisors, whose sum is σ = 11671410. Its totient is φ = 11671408.

The previous prime is 11671399. The next prime is 11671411. The reversal of 11671409 is 90417611.

11671409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11424400 + 247009 = 3380^2 + 497^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11671409 is a prime.

Together with 11671411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11671609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5835704 + 5835705.

It is an arithmetic number, because the mean of its divisors is an integer number (5835705).

Almost surely, 2^11671409 is an apocalyptic number.

It is an amenable number.

11671409 is a deficient number, since it is larger than the sum of its proper divisors (1).

11671409 is an equidigital number, since it uses as much as digits as its factorization.

11671409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 11671409 is about 3416.3443913048. The cubic root of 11671409 is about 226.8337971049.

The spelling of 11671409 in words is "eleven million, six hundred seventy-one thousand, four hundred nine".