675456409 has 4 divisors (see below), whose sum is σ = 675509940. Its totient is φ = 675402880.

The previous prime is 675456401. The next prime is 675456421. The reversal of 675456409 is 904654576.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 575856009 + 99600400 = 23997^2 + 9980^2 .

It is a cyclic number.

It is not a de Polignac number, because 675456409 - 2³ = 675456401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (675456401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3789 + ... + 36949.

It is an arithmetic number, because the mean of its divisors is an integer number (168877485).

Almost surely, 2^675456409 is an apocalyptic number.

It is an amenable number.

675456409 is a deficient number, since it is larger than the sum of its proper divisors (53531).

675456409 is a wasteful number, since it uses less digits than its factorization.

675456409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53530.

The product of its (nonzero) digits is 907200, while the sum is 46.

The square root of 675456409 is about 25989.5442245531. The cubic root of 675456409 is about 877.4029877357.

The spelling of 675456409 in words is "six hundred seventy-five million, four hundred fifty-six thousand, four hundred nine".