912409 has 2 divisors, whose sum is σ = 912410. Its totient is φ = 912408.

The previous prime is 912403. The next prime is 912413. The reversal of 912409 is 904219.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 585225 + 327184 = 765^2 + 572^2 .

It is an emirp because it is prime and its reverse (904219) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 912409 - 2¹¹ = 910361 is a prime.

It is not a weakly prime, because it can be changed into another prime (912403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 456204 + 456205.

It is an arithmetic number, because the mean of its divisors is an integer number (456205).

2⁹¹²⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

912409 is a deficient number, since it is larger than the sum of its proper divisors (1).

912409 is an equidigital number, since it uses as much as digits as its factorization.

912409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 912409 is about 955.2010259626. The cubic root of 912409 is about 96.9906463507.

It can be divided in two parts, 91 and 2409, that added together give a square (2500 = 50²).

The spelling of 912409 in words is "nine hundred twelve thousand, four hundred nine".