123612161 has 4 divisors (see below), whose sum is σ = 123681792. Its totient is φ = 123542532.

The previous prime is 123612127. The next prime is 123612179. The reversal of 123612161 is 161216321.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123612161 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123612121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32081 + ... + 35726.

It is an arithmetic number, because the mean of its divisors is an integer number (30920448).

Almost surely, 2^123612161 is an apocalyptic number.

It is an amenable number.

123612161 is a deficient number, since it is larger than the sum of its proper divisors (69631).

123612161 is an equidigital number, since it uses as much as digits as its factorization.

123612161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69630.

The product of its digits is 432, while the sum is 23.

The square root of 123612161 is about 11118.1006021712. The cubic root of 123612161 is about 498.1426570978.

Adding to 123612161 its reverse (161216321), we get a palindrome (284828482).

The spelling of 123612161 in words is "one hundred twenty-three million, six hundred twelve thousand, one hundred sixty-one".