731671009 has 6 divisors (see below), whose sum is σ = 764866466. Its totient is φ = 699858720.

The previous prime is 731671001. The next prime is 731671037. The reversal of 731671009 is 900176137.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 687488400 + 44182609 = 26220^2 + 6647^2 .

It is not a de Polignac number, because 731671009 - 2³ = 731671001 is a prime.

It is a super-2 number, since 2×731671009² = 1070684930822156162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (731671001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 691032 + ... + 692089.

Almost surely, 2^731671009 is an apocalyptic number.

It is an amenable number.

731671009 is a deficient number, since it is larger than the sum of its proper divisors (33195457).

731671009 is a wasteful number, since it uses less digits than its factorization.

731671009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383167 (or 1383144 counting only the distinct ones).

The product of its (nonzero) digits is 7938, while the sum is 34.

The square root of 731671009 is about 27049.4179050123. The cubic root of 731671009 is about 901.0978409420.

The spelling of 731671009 in words is "seven hundred thirty-one million, six hundred seventy-one thousand, nine".