31006345 has 8 divisors (see below), whose sum is σ = 37248840. Its totient is φ = 24777600.

The previous prime is 31006331. The next prime is 31006357. The reversal of 31006345 is 54360013.

It can be written as a sum of positive squares in 4 ways, for example, as 10837264 + 20169081 = 3292^2 + 4491^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-31006345 is a prime.

It is a super-2 number, since 2×31006345² = 1922786860518050, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 2445 + ... + 8245.

It is an arithmetic number, because the mean of its divisors is an integer number (4656105).

Almost surely, 2^31006345 is an apocalyptic number.

It is an amenable number.

31006345 is a deficient number, since it is larger than the sum of its proper divisors (6242495).

31006345 is a wasteful number, since it uses less digits than its factorization.

31006345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6875.

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

The square root of 31006345 is about 5568.3341314975. The cubic root of 31006345 is about 314.1594960999.

Adding to 31006345 its reverse (54360013), we get a palindrome (85366358).

The spelling of 31006345 in words is "thirty-one million, six thousand, three hundred forty-five".