31223045 has 24 divisors (see below), whose sum is σ = 45001728. Its totient is φ = 20714400.

The previous prime is 31223041. The next prime is 31223047. The reversal of 31223045 is 54032213.

It is a happy number.

It is not a de Polignac number, because 31223045 - 2² = 31223041 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31223041) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 5540 + ... + 9650.

It is an arithmetic number, because the mean of its divisors is an integer number (1875072).

Almost surely, 2^31223045 is an apocalyptic number.

31223045 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31223045 is a deficient number, since it is larger than the sum of its proper divisors (13778683).

31223045 is a wasteful number, since it uses less digits than its factorization.

31223045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4161 (or 4154 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 31223045 is about 5587.7584951392. The cubic root of 31223045 is about 314.8896732975.

Adding to 31223045 its reverse (54032213), we get a palindrome (85255258).

The spelling of 31223045 in words is "thirty-one million, two hundred twenty-three thousand, forty-five".