31123045555 has 48 divisors (see below), whose sum is σ = 43886616480. Its totient is φ = 21125626368.

The previous prime is 31123045553. The next prime is 31123045567. The reversal of 31123045555 is 55554032113.

It is not a de Polignac number, because 31123045555 - 2¹ = 31123045553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31123045555.

It is not an unprimeable number, because it can be changed into a prime (31123045553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14062629 + ... + 14064841.

It is an arithmetic number, because the mean of its divisors is an integer number (914304510).

Almost surely, 2^31123045555 is an apocalyptic number.

31123045555 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

31123045555 is a deficient number, since it is larger than the sum of its proper divisors (12763570925).

31123045555 is a wasteful number, since it uses less digits than its factorization.

31123045555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2788 (or 2781 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 34.

Adding to 31123045555 its reverse (55554032113), we get a palindrome (86677077668).

The spelling of 31123045555 in words is "thirty-one billion, one hundred twenty-three million, forty-five thousand, five hundred fifty-five".