809949655 has 16 divisors (see below), whose sum is σ = 984752064. Its totient is φ = 639475200.

The previous prime is 809949619. The next prime is 809949733. The reversal of 809949655 is 556949908.

It is a happy number.

It is not a de Polignac number, because 809949655 - 2¹⁹ = 809425367 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 809949596 and 809949605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115119 + ... + 121951.

It is an arithmetic number, because the mean of its divisors is an integer number (61547004).

Almost surely, 2^809949655 is an apocalyptic number.

809949655 is a deficient number, since it is larger than the sum of its proper divisors (174802409).

809949655 is a wasteful number, since it uses less digits than its factorization.

809949655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7146.

The product of its (nonzero) digits is 3499200, while the sum is 55.

The square root of 809949655 is about 28459.6144562782. The cubic root of 809949655 is about 932.1504385934.

The spelling of 809949655 in words is "eight hundred nine million, nine hundred forty-nine thousand, six hundred fifty-five".