31133443145 has 16 divisors (see below), whose sum is σ = 44169615360. Its totient is φ = 20612485824.

The previous prime is 31133443141. The next prime is 31133443151. The reversal of 31133443145 is 54134433113.

It is not a de Polignac number, because 31133443145 - 2² = 31133443141 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31133443141) 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, 15335657 + ... + 15337686.

It is an arithmetic number, because the mean of its divisors is an integer number (2760600960).

Almost surely, 2^31133443145 is an apocalyptic number.

31133443145 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31133443145 is a deficient number, since it is larger than the sum of its proper divisors (13036172215).

31133443145 is a wasteful number, since it uses less digits than its factorization.

31133443145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30673384.

The product of its digits is 25920, while the sum is 32.

Adding to 31133443145 its reverse (54134433113), we get a palindrome (85267876258).

The spelling of 31133443145 in words is "thirty-one billion, one hundred thirty-three million, four hundred forty-three thousand, one hundred forty-five".