123130311 has 4 divisors (see below), whose sum is σ = 164173752. Its totient is φ = 82086872.

The previous prime is 123130243. The next prime is 123130327. The reversal of 123130311 is 113031321.

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 123130311 - 2¹³ = 123122119 is a prime.

It is a super-2 number, since 2×123130311² = 30322146973913442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123130361) 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, 20521716 + ... + 20521721.

It is an arithmetic number, because the mean of its divisors is an integer number (41043438).

Almost surely, 2^123130311 is an apocalyptic number.

123130311 is a deficient number, since it is larger than the sum of its proper divisors (41043441).

123130311 is an equidigital number, since it uses as much as digits as its factorization.

123130311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41043440.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 123130311 is about 11096.4098248037. The cubic root of 123130311 is about 497.4945477210.

Adding to 123130311 its reverse (113031321), we get a palindrome (236161632).

The spelling of 123130311 in words is "one hundred twenty-three million, one hundred thirty thousand, three hundred eleven".