31331011123 has 4 divisors (see below), whose sum is σ = 32095182168. Its totient is φ = 30566840080.

The previous prime is 31331011073. The next prime is 31331011141. The reversal of 31331011123 is 32111013313.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31331011123 - 2¹⁷ = 31330880051 is a prime.

It is a super-2 number, since 2×31331011123² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31331011123.

It is not an unprimeable number, because it can be changed into a prime (31331014123) 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 3 ways as a sum of consecutive naturals, for example, 382085461 + ... + 382085542.

It is an arithmetic number, because the mean of its divisors is an integer number (8023795542).

Almost surely, 2^31331011123 is an apocalyptic number.

31331011123 is a deficient number, since it is larger than the sum of its proper divisors (764171045).

31331011123 is an equidigital number, since it uses as much as digits as its factorization.

31331011123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764171044.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 31331011123 its reverse (32111013313), we get a palindrome (63442024436).

The spelling of 31331011123 in words is "thirty-one billion, three hundred thirty-one million, eleven thousand, one hundred twenty-three".