123319917 has 18 divisors (see below), whose sum is σ = 207211758. Its totient is φ = 70468272.

The previous prime is 123319909. The next prime is 123319957. The reversal of 123319917 is 719913321.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 75585636 + 47734281 = 8694^2 + 6909^2 .

It is not a de Polignac number, because 123319917 - 2³ = 123319909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123319957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 139378 + ... + 140259.

Almost surely, 2^123319917 is an apocalyptic number.

It is an amenable number.

123319917 is a deficient number, since it is larger than the sum of its proper divisors (83891841).

123319917 is a wasteful number, since it uses less digits than its factorization.

123319917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279657 (or 279647 counting only the distinct ones).

The product of its digits is 10206, while the sum is 36.

The square root of 123319917 is about 11104.9501124499. The cubic root of 123319917 is about 497.7497775229.

The spelling of 123319917 in words is "one hundred twenty-three million, three hundred nineteen thousand, nine hundred seventeen".