123123115949 has 4 divisors (see below), whose sum is σ = 124960774464. Its totient is φ = 121285457436.

The previous prime is 123123115937. The next prime is 123123115987. The reversal of 123123115949 is 949511321321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 949511321321 = 23 ⋅41283100927.

It is a de Polignac number, because none of the positive numbers 2^k-123123115949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123123115909) 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, 918829157 + ... + 918829290.

It is an arithmetic number, because the mean of its divisors is an integer number (31240193616).

Almost surely, 2^123123115949 is an apocalyptic number.

It is an amenable number.

123123115949 is a deficient number, since it is larger than the sum of its proper divisors (1837658515).

123123115949 is an equidigital number, since it uses as much as digits as its factorization.

123123115949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1837658514.

The product of its digits is 58320, while the sum is 41.

The spelling of 123123115949 in words is "one hundred twenty-three billion, one hundred twenty-three million, one hundred fifteen thousand, nine hundred forty-nine".