731864809 has 9 divisors (see below), whose sum is σ = 792873669. Its totient is φ = 675242880.

The previous prime is 731864797. The next prime is 731864831. The reversal of 731864809 is 908468137.

It is a happy number.

The square root of 731864809 is 27053.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 176225625 + 555639184 = 13275^2 + 23572^2 .

It is not a de Polignac number, because 731864809 - 2¹⁵ = 731832041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (731864839) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 350649 + ... + 352729.

Almost surely, 2^731864809 is an apocalyptic number.

731864809 is the 27053-rd square number.

731864809 is the 13527-th centered octagonal number.

It is an amenable number.

731864809 is a deficient number, since it is larger than the sum of its proper divisors (61008860).

731864809 is an frugal number, since it uses more digits than its factorization.

731864809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4188 (or 2094 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 46.

The cubic root of 731864809 is about 901.1773927912.

It can be divided in two parts, 7318 and 64809, that added together give a palindrome (72127).

The spelling of 731864809 in words is "seven hundred thirty-one million, eight hundred sixty-four thousand, eight hundred nine".