123994181 has 4 divisors (see below), whose sum is σ = 125198112. Its totient is φ = 122790252.

The previous prime is 123994163. The next prime is 123994207. The reversal of 123994181 is 181499321.

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.

It is a cyclic number.

It is not a de Polignac number, because 123994181 - 2¹⁰ = 123993157 is a prime.

It is a super-2 number, since 2×123994181² = 30749113843721522, 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 (123994121) 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, 601811 + ... + 602016.

It is an arithmetic number, because the mean of its divisors is an integer number (31299528).

Almost surely, 2^123994181 is an apocalyptic number.

It is an amenable number.

123994181 is a deficient number, since it is larger than the sum of its proper divisors (1203931).

123994181 is a wasteful number, since it uses less digits than its factorization.

123994181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203930.

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

The square root of 123994181 is about 11135.2674417815. The cubic root of 123994181 is about 498.6552947778.

The spelling of 123994181 in words is "one hundred twenty-three million, nine hundred ninety-four thousand, one hundred eighty-one".