904161409 has 4 divisors (see below), whose sum is σ = 905529940. Its totient is φ = 902792880.

The previous prime is 904161389. The next prime is 904161437.

904161409 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 754710784 + 149450625 = 27472^2 + 12225^2 .

It is a cyclic number.

It is not a de Polignac number, because 904161409 - 2²⁵ = 870606977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (904164409) 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 in 3 ways as a sum of consecutive naturals, for example, 683274 + ... + 684595.

It is an arithmetic number, because the mean of its divisors is an integer number (226382485).

Almost surely, 2^904161409 is an apocalyptic number.

It is an amenable number.

904161409 is a deficient number, since it is larger than the sum of its proper divisors (1368531).

904161409 is a wasteful number, since it uses less digits than its factorization.

904161409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368530.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 904161409 is about 30069.2768286835. The cubic root of 904161409 is about 966.9751696403.

The spelling of 904161409 in words is "nine hundred four million, one hundred sixty-one thousand, four hundred nine".