11551409 has 2 divisors, whose sum is σ = 11551410. Its totient is φ = 11551408.

The previous prime is 11551369. The next prime is 11551417. The reversal of 11551409 is 90415511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9591409 + 1960000 = 3097^2 + 1400^2 .

It is a cyclic number.

It is not a de Polignac number, because 11551409 - 2¹² = 11547313 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p₇₆₀₄₈₁ and since 11551409 and 760481 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (11551469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5775704 + 5775705.

It is an arithmetic number, because the mean of its divisors is an integer number (5775705).

Almost surely, 2^11551409 is an apocalyptic number.

It is an amenable number.

11551409 is a deficient number, since it is larger than the sum of its proper divisors (1).

11551409 is an equidigital number, since it uses as much as digits as its factorization.

11551409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 11551409 is about 3398.7363828341. The cubic root of 11551409 is about 226.0537176196.

The spelling of 11551409 in words is "eleven million, five hundred fifty-one thousand, four hundred nine".