675451821 has 8 divisors (see below), whose sum is σ = 982475424. Its totient is φ = 409364720.

The previous prime is 675451813. The next prime is 675451823. The reversal of 675451821 is 128154576.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 675451821 - 2³ = 675451813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 675451821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (675451823) 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 7 ways as a sum of consecutive naturals, for example, 10234086 + ... + 10234151.

It is an arithmetic number, because the mean of its divisors is an integer number (122809428).

Almost surely, 2^675451821 is an apocalyptic number.

It is an amenable number.

675451821 is a deficient number, since it is larger than the sum of its proper divisors (307023603).

675451821 is a wasteful number, since it uses less digits than its factorization.

675451821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20468251.

The product of its digits is 67200, while the sum is 39.

The square root of 675451821 is about 25989.4559581381. The cubic root of 675451821 is about 877.4010011609.

The spelling of 675451821 in words is "six hundred seventy-five million, four hundred fifty-one thousand, eight hundred twenty-one".