675423521 has 4 divisors (see below), whose sum is σ = 684675972. Its totient is φ = 666171072.

The previous prime is 675423509. The next prime is 675423523. The reversal of 675423521 is 125324576.

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 447745600 + 227677921 = 21160^2 + 15089^2 .

It is a cyclic number.

It is not a de Polignac number, because 675423521 - 2²⁶ = 608314657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (675423523) 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, 4626116 + ... + 4626261.

It is an arithmetic number, because the mean of its divisors is an integer number (171168993).

Almost surely, 2^675423521 is an apocalyptic number.

It is an amenable number.

675423521 is a deficient number, since it is larger than the sum of its proper divisors (9252451).

675423521 is an equidigital number, since it uses as much as digits as its factorization.

675423521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9252450.

The product of its digits is 50400, while the sum is 35.

The square root of 675423521 is about 25988.9115008690. The cubic root of 675423521 is about 877.3887472422.

The spelling of 675423521 in words is "six hundred seventy-five million, four hundred twenty-three thousand, five hundred twenty-one".