31282745 has 12 divisors (see below), whose sum is σ = 40650156. Its totient is φ = 23100480.

The previous prime is 31282739. The next prime is 31282747. The reversal of 31282745 is 54728213.

It can be written as a sum of positive squares in 6 ways, for example, as 13075456 + 18207289 = 3616^2 + 4267^2 .

It is not a de Polignac number, because 31282745 - 2⁴ = 31282729 is a prime.

It is a super-2 number, since 2×31282745² = 1957220269470050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31282747) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17666 + ... + 19355.

It is an arithmetic number, because the mean of its divisors is an integer number (3387513).

Almost surely, 2^31282745 is an apocalyptic number.

It is an amenable number.

31282745 is a deficient number, since it is larger than the sum of its proper divisors (9367411).

31282745 is a wasteful number, since it uses less digits than its factorization.

31282745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37052 (or 37039 counting only the distinct ones).

The product of its digits is 13440, while the sum is 32.

The square root of 31282745 is about 5593.0979787592. The cubic root of 31282745 is about 315.0902403757.

The spelling of 31282745 in words is "thirty-one million, two hundred eighty-two thousand, seven hundred forty-five".