123131311 has 4 divisors (see below), whose sum is σ = 123191224. Its totient is φ = 123071400.

The previous prime is 123131293. The next prime is 123131329. The reversal of 123131311 is 113131321.

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

It is an interprime number because it is at equal distance from previous prime (123131293) and next prime (123131329).

It is a cyclic number.

It is not a de Polignac number, because 123131311 - 2⁵ = 123131279 is a prime.

It is a super-2 number, since 2×123131311² = 30322639497157442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123132311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26760 + ... + 31021.

It is an arithmetic number, because the mean of its divisors is an integer number (30797806).

Almost surely, 2^123131311 is an apocalyptic number.

123131311 is a deficient number, since it is larger than the sum of its proper divisors (59913).

123131311 is an equidigital number, since it uses as much as digits as its factorization.

123131311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59912.

The product of its digits is 54, while the sum is 16.

The square root of 123131311 is about 11096.4548843313. The cubic root of 123131311 is about 497.4958945142.

Adding to 123131311 its reverse (113131321), we get a palindrome (236262632).

The spelling of 123131311 in words is "one hundred twenty-three million, one hundred thirty-one thousand, three hundred eleven".