31031145 has 12 divisors (see below), whose sum is σ = 53787396. Its totient is φ = 16549920.

The previous prime is 31031083. The next prime is 31031201. The reversal of 31031145 is 54113013.

31031145 is a `hidden beast` number, since 310 + 311 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4652649 + 26378496 = 2157^2 + 5136^2 .

It is not a de Polignac number, because 31031145 - 2⁶ = 31031081 is a prime.

It is a super-2 number, since 2×31031145² = 1925863920022050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 344746 + ... + 344835.

It is an arithmetic number, because the mean of its divisors is an integer number (4482283).

Almost surely, 2^31031145 is an apocalyptic number.

It is an amenable number.

31031145 is a deficient number, since it is larger than the sum of its proper divisors (22756251).

31031145 is a wasteful number, since it uses less digits than its factorization.

31031145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689592 (or 689589 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 31031145 is about 5570.5605642520. The cubic root of 31031145 is about 314.2432325008.

Adding to 31031145 its reverse (54113013), we get a palindrome (85144158).

The spelling of 31031145 in words is "thirty-one million, thirty-one thousand, one hundred forty-five".