813145689 has 16 divisors (see below), whose sum is σ = 1213861440. Its totient is φ = 537956640.

The previous prime is 813145673. The next prime is 813145693. The reversal of 813145689 is 986541318.

813145689 is a `hidden beast` number, since 81 + 3 + 1 + 4 + 568 + 9 = 666.

It is not a de Polignac number, because 813145689 - 2⁴ = 813145673 is a prime.

It is a super-2 number, since 2×813145689² = 1322411823078569442, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (813145699) 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 15 ways as a sum of consecutive naturals, for example, 111412 + ... + 118485.

It is an arithmetic number, because the mean of its divisors is an integer number (75866340).

Almost surely, 2^813145689 is an apocalyptic number.

It is an amenable number.

813145689 is a deficient number, since it is larger than the sum of its proper divisors (400715751).

813145689 is a wasteful number, since it uses less digits than its factorization.

813145689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230037 (or 230031 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 813145689 is about 28515.7095124775. The cubic root of 813145689 is about 933.3749074877.

The spelling of 813145689 in words is "eight hundred thirteen million, one hundred forty-five thousand, six hundred eighty-nine".