809345953 has 4 divisors (see below), whose sum is σ = 871603348. Its totient is φ = 747088560.

The previous prime is 809345951. The next prime is 809345959. The reversal of 809345953 is 359543908.

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 448041889 + 361304064 = 21167^2 + 19008^2 .

It is a cyclic number.

It is not a de Polignac number, because 809345953 - 2¹ = 809345951 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (809345951) 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, 31128678 + ... + 31128703.

It is an arithmetic number, because the mean of its divisors is an integer number (217900837).

Almost surely, 2^809345953 is an apocalyptic number.

It is an amenable number.

809345953 is a deficient number, since it is larger than the sum of its proper divisors (62257395).

809345953 is a wasteful number, since it uses less digits than its factorization.

809345953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62257394.

The product of its (nonzero) digits is 583200, while the sum is 46.

The square root of 809345953 is about 28449.0061865085. The cubic root of 809345953 is about 931.9187859415.

The spelling of 809345953 in words is "eight hundred nine million, three hundred forty-five thousand, nine hundred fifty-three".