813457289 has 4 divisors (see below), whose sum is σ = 816948756. Its totient is φ = 809965824.

The previous prime is 813457277. The next prime is 813457291. The reversal of 813457289 is 982754318.

It is a happy number.

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 210018064 + 603439225 = 14492^2 + 24565^2 .

It is a cyclic number.

It is not a de Polignac number, because 813457289 - 2¹⁶ = 813391753 is a prime.

It is a super-2 number, since 2×813457289² = 1323425522054459042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813457219) 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, 1745384 + ... + 1745849.

It is an arithmetic number, because the mean of its divisors is an integer number (204237189).

Almost surely, 2^813457289 is an apocalyptic number.

It is an amenable number.

813457289 is a deficient number, since it is larger than the sum of its proper divisors (3491467).

813457289 is a wasteful number, since it uses less digits than its factorization.

813457289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3491466.

The product of its digits is 483840, while the sum is 47.

The square root of 813457289 is about 28521.1726441954. The cubic root of 813457289 is about 933.4941163342.

The spelling of 813457289 in words is "eight hundred thirteen million, four hundred fifty-seven thousand, two hundred eighty-nine".