123028581 has 16 divisors (see below), whose sum is σ = 176981504. Its totient is φ = 75570624.

The previous prime is 123028567. The next prime is 123028597. The reversal of 123028581 is 185820321.

It is not a de Polignac number, because 123028581 - 2¹³ = 123020389 is a prime.

It is a super-2 number, since 2×123028581² = 30272063485747122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123028501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21075 + ... + 26271.

It is an arithmetic number, because the mean of its divisors is an integer number (11061344).

Almost surely, 2^123028581 is an apocalyptic number.

It is an amenable number.

123028581 is a deficient number, since it is larger than the sum of its proper divisors (53952923).

123028581 is a wasteful number, since it uses less digits than its factorization.

123028581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5820.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 123028581 is about 11091.8249625569. The cubic root of 123028581 is about 497.3575003270.

The spelling of 123028581 in words is "one hundred twenty-three million, twenty-eight thousand, five hundred eighty-one".