123814991 has 4 divisors (see below), whose sum is σ = 125040984. Its totient is φ = 122589000.

The previous prime is 123814939. The next prime is 123815053. The reversal of 123814991 is 199418321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123814991 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 (123814091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 612845 + ... + 613046.

It is an arithmetic number, because the mean of its divisors is an integer number (31260246).

Almost surely, 2^123814991 is an apocalyptic number.

123814991 is a deficient number, since it is larger than the sum of its proper divisors (1225993).

123814991 is a wasteful number, since it uses less digits than its factorization.

123814991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225992.

The product of its digits is 15552, while the sum is 38.

The square root of 123814991 is about 11127.2184754322. The cubic root of 123814991 is about 498.4149686608.

The spelling of 123814991 in words is "one hundred twenty-three million, eight hundred fourteen thousand, nine hundred ninety-one".