123361281 has 36 divisors (see below), whose sum is σ = 192651888. Its totient is φ = 76014288.

The previous prime is 123361261. The next prime is 123361289. The reversal of 123361281 is 182163321.

It is a happy number.

123361281 is a `hidden beast` number, since 1 + 23 + 361 + 281 = 666.

It is not a de Polignac number, because 123361281 - 2¹⁷ = 123230209 is a prime.

It is a super-2 number, since 2×123361281² = 30436011299921922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123361289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 139266 + ... + 140148.

Almost surely, 2^123361281 is an apocalyptic number.

It is an amenable number.

123361281 is a deficient number, since it is larger than the sum of its proper divisors (69290607).

123361281 is a wasteful number, since it uses less digits than its factorization.

123361281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970 (or 948 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 123361281 is about 11106.8123689923. The cubic root of 123361281 is about 497.8054230903.

The spelling of 123361281 in words is "one hundred twenty-three million, three hundred sixty-one thousand, two hundred eighty-one".