123911281 has 16 divisors (see below), whose sum is σ = 140950656. Its totient is φ = 108066816.

The previous prime is 123911273. The next prime is 123911299. The reversal of 123911281 is 182119321.

It is not a de Polignac number, because 123911281 - 2³ = 123911273 is a prime.

It is a super-2 number, since 2×123911281² = 30708011118121922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123911201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22321 + ... + 27313.

It is an arithmetic number, because the mean of its divisors is an integer number (8809416).

Almost surely, 2^123911281 is an apocalyptic number.

It is an amenable number.

123911281 is a deficient number, since it is larger than the sum of its proper divisors (17039375).

123911281 is a wasteful number, since it uses less digits than its factorization.

123911281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5112.

The product of its digits is 864, while the sum is 28.

The square root of 123911281 is about 11131.5444121649. The cubic root of 123911281 is about 498.5441397227.

The spelling of 123911281 in words is "one hundred twenty-three million, nine hundred eleven thousand, two hundred eighty-one".