123144919 has 4 divisors (see below), whose sum is σ = 123231240. Its totient is φ = 123058600.

The previous prime is 123144913. The next prime is 123144929. The reversal of 123144919 is 919441321.

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 123144919 - 2³ = 123144911 is a prime.

It is a super-2 number, since 2×123144919² = 30329342151033122, 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 (123144911) 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, 40984 + ... + 43885.

It is an arithmetic number, because the mean of its divisors is an integer number (30807810).

Almost surely, 2^123144919 is an apocalyptic number.

123144919 is a deficient number, since it is larger than the sum of its proper divisors (86321).

123144919 is an equidigital number, since it uses as much as digits as its factorization.

123144919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86320.

The product of its digits is 7776, while the sum is 34.

The square root of 123144919 is about 11097.0680361977. The cubic root of 123144919 is about 497.5142209515.

The spelling of 123144919 in words is "one hundred twenty-three million, one hundred forty-four thousand, nine hundred nineteen".