123067561 has 16 divisors (see below), whose sum is σ = 131308560. Its totient is φ = 115153920.

The previous prime is 123067523. The next prime is 123067589. The reversal of 123067561 is 165760321.

It can be written as a sum of positive squares in 8 ways, for example, as 10601536 + 112466025 = 3256^2 + 10605^2 .

It is a cyclic number.

It is not a de Polignac number, because 123067561 - 2¹⁹ = 122543273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123067261) 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, 128661 + ... + 129613.

It is an arithmetic number, because the mean of its divisors is an integer number (8206785).

Almost surely, 2^123067561 is an apocalyptic number.

It is an amenable number.

123067561 is a deficient number, since it is larger than the sum of its proper divisors (8240999).

123067561 is an equidigital number, since it uses as much as digits as its factorization.

123067561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 123067561 is about 11093.5819733754. The cubic root of 123067561 is about 497.4100218578.

The spelling of 123067561 in words is "one hundred twenty-three million, sixty-seven thousand, five hundred sixty-one".