123140281 has 16 divisors (see below), whose sum is σ = 136603008. Its totient is φ = 110073600.

The previous prime is 123140279. The next prime is 123140291. The reversal of 123140281 is 182041321.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 123140281 - 2¹ = 123140279 is a prime.

It is a super-2 number, since 2×123140281² = 30327057609517922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123140221) 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, 194836 + ... + 195466.

It is an arithmetic number, because the mean of its divisors is an integer number (8537688).

Almost surely, 2^123140281 is an apocalyptic number.

123140281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123140281 is a deficient number, since it is larger than the sum of its proper divisors (13462727).

123140281 is a wasteful number, since it uses less digits than its factorization.

123140281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 123140281 is about 11096.8590601125. The cubic root of 123140281 is about 497.5079749233.

The spelling of 123140281 in words is "one hundred twenty-three million, one hundred forty thousand, two hundred eighty-one".