813449537 has 4 divisors (see below), whose sum is σ = 813510276. Its totient is φ = 813388800.

The previous prime is 813449531. The next prime is 813449561. The reversal of 813449537 is 735944318.

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 501715201 + 311734336 = 22399^2 + 17656^2 .

It is a cyclic number.

It is not a de Polignac number, because 813449537 - 2⁸ = 813449281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813449531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464 + ... + 40337.

It is an arithmetic number, because the mean of its divisors is an integer number (203377569).

Almost surely, 2^813449537 is an apocalyptic number.

It is an amenable number.

813449537 is a deficient number, since it is larger than the sum of its proper divisors (60739).

813449537 is a wasteful number, since it uses less digits than its factorization.

813449537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60738.

The product of its digits is 362880, while the sum is 44.

The square root of 813449537 is about 28521.0367448310. The cubic root of 813449537 is about 933.4911510200.

The spelling of 813449537 in words is "eight hundred thirteen million, four hundred forty-nine thousand, five hundred thirty-seven".