3123431285 has 16 divisors (see below), whose sum is σ = 4039371504. Its totient is φ = 2304855552.

The previous prime is 3123431281. The next prime is 3123431287. The reversal of 3123431285 is 5821343213.

It can be written as a sum of positive squares in 8 ways, for example, as 14922769 + 3108508516 = 3863^2 + 55754^2 .

It is a cyclic number.

It is not a de Polignac number, because 3123431285 - 2² = 3123431281 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 (3123431281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76379 + ... + 109911.

It is an arithmetic number, because the mean of its divisors is an integer number (252460719).

Almost surely, 2^3123431285 is an apocalyptic number.

It is an amenable number.

3123431285 is a deficient number, since it is larger than the sum of its proper divisors (915940219).

3123431285 is a wasteful number, since it uses less digits than its factorization.

3123431285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34984.

The product of its digits is 17280, while the sum is 32.

The square root of 3123431285 is about 55887.6666626904. Note that the first 5 decimals coincide. The cubic root of 3123431285 is about 1461.7641908007.

Adding to 3123431285 its reverse (5821343213), we get a palindrome (8944774498).

The spelling of 3123431285 in words is "three billion, one hundred twenty-three million, four hundred thirty-one thousand, two hundred eighty-five".