845779969 has 4 divisors (see below), whose sum is σ = 845843796. Its totient is φ = 845716144.

The previous prime is 845779967. The next prime is 845779997. The reversal of 845779969 is 969977548.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 766569969 + 79210000 = 27687^2 + 8900^2 .

It is a cyclic number.

It is not a de Polignac number, because 845779969 - 2¹ = 845779967 is a prime.

It is a super-2 number, since 2×845779969² = 1430687511923281922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 845779969.

It is not an unprimeable number, because it can be changed into a prime (845779967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3754 + ... + 41299.

It is an arithmetic number, because the mean of its divisors is an integer number (211460949).

Almost surely, 2^845779969 is an apocalyptic number.

It is an amenable number.

845779969 is a deficient number, since it is larger than the sum of its proper divisors (63827).

845779969 is a wasteful number, since it uses less digits than its factorization.

845779969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63826.

The product of its digits is 34292160, while the sum is 64.

The square root of 845779969 is about 29082.2964877260. The cubic root of 845779969 is about 945.6979881055.

The spelling of 845779969 in words is "eight hundred forty-five million, seven hundred seventy-nine thousand, nine hundred sixty-nine".