31131231311123 has 8 divisors (see below), whose sum is σ = 31267337617968. Its totient is φ = 30995391619584.

The previous prime is 31131231311113. The next prime is 31131231311129. The reversal of 31131231311123 is 32111313213113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31131231311123 - 2³² = 31126936343827 is a prime.

It is a super-2 number, since 2×31131231311123² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31131231311092 and 31131231311101.

It is not an unprimeable number, because it can be changed into a prime (31131231311129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66419786 + ... + 66886847.

It is an arithmetic number, because the mean of its divisors is an integer number (3908417202246).

Almost surely, 2^{31131231311123} is an apocalyptic number.

31131231311123 is a deficient number, since it is larger than the sum of its proper divisors (136106306845).

31131231311123 is a wasteful number, since it uses less digits than its factorization.

31131231311123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133307653.

The product of its digits is 972, while the sum is 26.

Adding to 31131231311123 its reverse (32111313213113), we get a palindrome (63242544524236).

The spelling of 31131231311123 in words is "thirty-one trillion, one hundred thirty-one billion, two hundred thirty-one million, three hundred eleven thousand, one hundred twenty-three".