920809649 has 8 divisors (see below), whose sum is σ = 924323400. Its totient is φ = 917303296.

The previous prime is 920809621. The next prime is 920809691. The reversal of 920809649 is 946908029.

920809649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 129231424 + 791578225 = 11368^2 + 28135^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-920809649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (920809619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 383597 + ... + 385989.

It is an arithmetic number, because the mean of its divisors is an integer number (115540425).

Almost surely, 2^920809649 is an apocalyptic number.

It is an amenable number.

920809649 is a deficient number, since it is larger than the sum of its proper divisors (3513751).

920809649 is a wasteful number, since it uses less digits than its factorization.

920809649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3699.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 920809649 is about 30344.8455095754. The cubic root of 920809649 is about 972.8740525531.

The spelling of 920809649 in words is "nine hundred twenty million, eight hundred nine thousand, six hundred forty-nine".