31838609 has 6 divisors (see below), whose sum is σ = 34996290. Its totient is φ = 28944080.

The previous prime is 31838567. The next prime is 31838617. The reversal of 31838609 is 90683813.

31838609 = 96² + 97² + ... + 458².

It can be written as a sum of positive squares in only one way, i.e., 25603600 + 6235009 = 5060^2 + 2497^2 .

It is not a de Polignac number, because 31838609 - 2⁸ = 31838353 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31838669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 131444 + ... + 131685.

It is an arithmetic number, because the mean of its divisors is an integer number (5832715).

Almost surely, 2^31838609 is an apocalyptic number.

It is an amenable number.

31838609 is a deficient number, since it is larger than the sum of its proper divisors (3157681).

31838609 is a wasteful number, since it uses less digits than its factorization.

31838609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263151 (or 263140 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 31838609 is about 5642.5711338006. The cubic root of 31838609 is about 316.9455767411.

The spelling of 31838609 in words is "thirty-one million, eight hundred thirty-eight thousand, six hundred nine".