123106316291 has 4 divisors (see below), whose sum is σ = 140692932912. Its totient is φ = 105519699672.

The previous prime is 123106316287. The next prime is 123106316299. The reversal of 123106316291 is 192613601321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192613601321 = 290027 ⋅664123.

It is a cyclic number.

It is not a de Polignac number, because 123106316291 - 2² = 123106316287 is a prime.

It is a super-2 number, since 2×123106316291² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123106316299) 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, 8793308300 + ... + 8793308313.

It is an arithmetic number, because the mean of its divisors is an integer number (35173233228).

Almost surely, 2^123106316291 is an apocalyptic number.

123106316291 is a deficient number, since it is larger than the sum of its proper divisors (17586616621).

123106316291 is an equidigital number, since it uses as much as digits as its factorization.

123106316291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17586616620.

The product of its (nonzero) digits is 11664, while the sum is 35.

The spelling of 123106316291 in words is "one hundred twenty-three billion, one hundred six million, three hundred sixteen thousand, two hundred ninety-one".