31730065 has 8 divisors (see below), whose sum is σ = 38700648. Its totient is φ = 24967680.

The previous prime is 31730063. The next prime is 31730119. The reversal of 31730065 is 56003713.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 21904 + 31708161 = 148^2 + 5631^2 .

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

It is not a de Polignac number, because 31730065 - 2¹ = 31730063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31730063) 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 7 ways as a sum of consecutive naturals, for example, 51712 + ... + 52321.

It is an arithmetic number, because the mean of its divisors is an integer number (4837581).

Almost surely, 2^31730065 is an apocalyptic number.

It is an amenable number.

31730065 is a deficient number, since it is larger than the sum of its proper divisors (6970583).

31730065 is a wasteful number, since it uses less digits than its factorization.

31730065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104099.

The product of its (nonzero) digits is 1890, while the sum is 25.

The square root of 31730065 is about 5632.9446118349. The cubic root of 31730065 is about 316.5849903235.

Adding to 31730065 its reverse (56003713), we get a palindrome (87733778).

The spelling of 31730065 in words is "thirty-one million, seven hundred thirty thousand, sixty-five".