147675821 has 6 divisors (see below), whose sum is σ = 156873930. Its totient is φ = 138988736.

The previous prime is 147675817. The next prime is 147675851. The reversal of 147675821 is 128576741.

It can be written as a sum of positive squares in 3 ways, for example, as 99720196 + 47955625 = 9986^2 + 6925^2 .

It is not a de Polignac number, because 147675821 - 2² = 147675817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (147675851) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 255206 + ... + 255783.

It is an arithmetic number, because the mean of its divisors is an integer number (26145655).

Almost surely, 2^147675821 is an apocalyptic number.

It is an amenable number.

147675821 is a deficient number, since it is larger than the sum of its proper divisors (9198109).

147675821 is an equidigital number, since it uses as much as digits as its factorization.

147675821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511023 (or 511006 counting only the distinct ones).

The product of its digits is 94080, while the sum is 41.

The square root of 147675821 is about 12152.1940817286. The cubic root of 147675821 is about 528.5707558620.

The spelling of 147675821 in words is "one hundred forty-seven million, six hundred seventy-five thousand, eight hundred twenty-one".