123311919 has 16 divisors (see below), whose sum is σ = 174343680. Its totient is φ = 77307840.

The previous prime is 123311899. The next prime is 123311921. The reversal of 123311919 is 919113321.

It is a happy number.

It is not a de Polignac number, because 123311919 - 2⁷ = 123311791 is a prime.

It is a super-2 number, since 2×123311919² = 30411658734925122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123311939) 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 15 ways as a sum of consecutive naturals, for example, 87 + ... + 15704.

It is an arithmetic number, because the mean of its divisors is an integer number (10896480).

Almost surely, 2^123311919 is an apocalyptic number.

123311919 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

123311919 is a deficient number, since it is larger than the sum of its proper divisors (51031761).

123311919 is a wasteful number, since it uses less digits than its factorization.

123311919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15950.

The product of its digits is 1458, while the sum is 30.

The square root of 123311919 is about 11104.5899969337. The cubic root of 123311919 is about 497.7390166529.

The spelling of 123311919 in words is "one hundred twenty-three million, three hundred eleven thousand, nine hundred nineteen".