123256281 has 4 divisors (see below), whose sum is σ = 164341712. Its totient is φ = 82170852.

The previous prime is 123256277. The next prime is 123256321. The reversal of 123256281 is 182652321.

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 not a de Polignac number, because 123256281 - 2² = 123256277 is a prime.

It is a super-2 number, since 2×123256281² = 30384221611901922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123256261) 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 3 ways as a sum of consecutive naturals, for example, 20542711 + ... + 20542716.

It is an arithmetic number, because the mean of its divisors is an integer number (41085428).

Almost surely, 2^123256281 is an apocalyptic number.

It is an amenable number.

123256281 is a deficient number, since it is larger than the sum of its proper divisors (41085431).

123256281 is an equidigital number, since it uses as much as digits as its factorization.

123256281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41085430.

The product of its digits is 5760, while the sum is 30.

The square root of 123256281 is about 11102.0845339963. The cubic root of 123256281 is about 497.6641458978.

The spelling of 123256281 in words is "one hundred twenty-three million, two hundred fifty-six thousand, two hundred eighty-one".