812490909 has 4 divisors (see below), whose sum is σ = 1083321216. Its totient is φ = 541660604.

The previous prime is 812490907. The next prime is 812490919. The reversal of 812490909 is 909094218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 812490909 - 2¹ = 812490907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812490907) 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, 135415149 + ... + 135415154.

It is an arithmetic number, because the mean of its divisors is an integer number (270830304).

Almost surely, 2^812490909 is an apocalyptic number.

It is an amenable number.

812490909 is a deficient number, since it is larger than the sum of its proper divisors (270830307).

812490909 is a wasteful number, since it uses less digits than its factorization.

812490909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270830306.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 812490909 is about 28504.2261603433. The cubic root of 812490909 is about 933.1243089596.

The spelling of 812490909 in words is "eight hundred twelve million, four hundred ninety thousand, nine hundred nine".