123267561 has 16 divisors (see below), whose sum is σ = 174613824. Its totient is φ = 77082624.

The previous prime is 123267553. The next prime is 123267569. The reversal of 123267561 is 165762321.

It is an interprime number because it is at equal distance from previous prime (123267553) and next prime (123267569).

It is not a de Polignac number, because 123267561 - 2³ = 123267553 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123267569) 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, 11721 + ... + 19593.

It is an arithmetic number, because the mean of its divisors is an integer number (10913364).

Almost surely, 2^123267561 is an apocalyptic number.

It is an amenable number.

123267561 is a deficient number, since it is larger than the sum of its proper divisors (51346263).

123267561 is a wasteful number, since it uses less digits than its factorization.

123267561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8200.

The product of its digits is 15120, while the sum is 33.

The square root of 123267561 is about 11102.5925350794. The cubic root of 123267561 is about 497.6793269506.

The spelling of 123267561 in words is "one hundred twenty-three million, two hundred sixty-seven thousand, five hundred sixty-one".