123131011 has 8 divisors (see below), whose sum is σ = 124027904. Its totient is φ = 122237640.

The previous prime is 123131009. The next prime is 123131033. The reversal of 123131011 is 110131321.

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 123131011 - 2¹ = 123131009 is a prime.

It is a super-2 number, since 2×123131011² = 30322491739764242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123130982 and 123131000.

It is not an unprimeable number, because it can be changed into a prime (123132011) 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, 126850 + ... + 127816.

It is an arithmetic number, because the mean of its divisors is an integer number (15503488).

Almost surely, 2^123131011 is an apocalyptic number.

123131011 is a deficient number, since it is larger than the sum of its proper divisors (896893).

123131011 is an equidigital number, since it uses as much as digits as its factorization.

123131011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 123131011 is about 11096.4413664922. The cubic root of 123131011 is about 497.4954904770.

Adding to 123131011 its reverse (110131321), we get a palindrome (233262332).

It can be divided in two parts, 1231310 and 11, that added together give a palindrome (1231321).

The spelling of 123131011 in words is "one hundred twenty-three million, one hundred thirty-one thousand, eleven".