812957641 has 4 divisors (see below), whose sum is σ = 813468292. Its totient is φ = 812446992.

The previous prime is 812957633. The next prime is 812957647. The reversal of 812957641 is 146759218.

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 44836416 + 768121225 = 6696^2 + 27715^2 .

It is a cyclic number.

It is not a de Polignac number, because 812957641 - 2³ = 812957633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812957647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252930 + ... + 256123.

It is an arithmetic number, because the mean of its divisors is an integer number (203367073).

Almost surely, 2^812957641 is an apocalyptic number.

It is an amenable number.

812957641 is a deficient number, since it is larger than the sum of its proper divisors (510651).

812957641 is a wasteful number, since it uses less digits than its factorization.

812957641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510650.

The product of its digits is 120960, while the sum is 43.

The square root of 812957641 is about 28512.4120515961. The cubic root of 812957641 is about 933.3029512077.

The spelling of 812957641 in words is "eight hundred twelve million, nine hundred fifty-seven thousand, six hundred forty-one".