31123345 has 16 divisors (see below), whose sum is σ = 43141248. Its totient is φ = 21303040.

The previous prime is 31123343. The next prime is 31123361. The reversal of 31123345 is 54332113.

It is not a de Polignac number, because 31123345 - 2¹ = 31123343 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31123343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15709 + ... + 17578.

It is an arithmetic number, because the mean of its divisors is an integer number (2696328).

Almost surely, 2^31123345 is an apocalyptic number.

It is an amenable number.

31123345 is a deficient number, since it is larger than the sum of its proper divisors (12017903).

31123345 is a wasteful number, since it uses less digits than its factorization.

31123345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33320.

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

The square root of 31123345 is about 5578.8300744869. The cubic root of 31123345 is about 314.5541521500.

Adding to 31123345 its reverse (54332113), we get a palindrome (85455458).

The spelling of 31123345 in words is "thirty-one million, one hundred twenty-three thousand, three hundred forty-five".