123011 has 4 divisors (see below), whose sum is σ = 140592. Its totient is φ = 105432.

The previous prime is 123007. The next prime is 123017. The reversal of 123011 is 110321.

123011 = 8⁴ + 9⁴ + ... + 14⁴.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123011 - 2² = 123007 is a prime.

It is a super-2 number, since 2×123011² = 30263412242, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 123011.

It is not an unprimeable number, because it can be changed into a prime (123017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8780 + ... + 8793.

It is an arithmetic number, because the mean of its divisors is an integer number (35148).

2¹²³⁰¹¹ is an apocalyptic number.

123011 is a deficient number, since it is larger than the sum of its proper divisors (17581).

123011 is an equidigital number, since it uses as much as digits as its factorization.

123011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17580.

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 123011 is about 350.7292402980. The cubic root of 123011 is about 49.7333808112.

Adding to 123011 its reverse (110321), we get a palindrome (233332).

It can be divided in two parts, 1230 and 11, that multiplied together give a triangular number (13530 = T₁₆₄).

The spelling of 123011 in words is "one hundred twenty-three thousand, eleven", and thus it is an iban number.