31304065 has 16 divisors (see below), whose sum is σ = 40589136. Its totient is φ = 23040000.

The previous prime is 31304029. The next prime is 31304107. The reversal of 31304065 is 56040313.

It can be written as a sum of positive squares in 8 ways, for example, as 2660161 + 28643904 = 1631^2 + 5352^2 .

It is not a de Polignac number, because 31304065 - 2¹⁵ = 31271297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 25465 + ... + 26665.

It is an arithmetic number, because the mean of its divisors is an integer number (2536821).

Almost surely, 2^31304065 is an apocalyptic number.

It is an amenable number.

31304065 is a deficient number, since it is larger than the sum of its proper divisors (9285071).

31304065 is a wasteful number, since it uses less digits than its factorization.

31304065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1620.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 31304065 is about 5595.0035746191. The cubic root of 31304065 is about 315.1618048372.

Adding to 31304065 its reverse (56040313), we get a palindrome (87344378).

The spelling of 31304065 in words is "thirty-one million, three hundred four thousand, sixty-five".