123055661 has 4 divisors (see below), whose sum is σ = 123159324. Its totient is φ = 122952000.

The previous prime is 123055657. The next prime is 123055663. The reversal of 123055661 is 166550321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1394761 + 121660900 = 1181^2 + 11030^2 .

It is a cyclic number.

It is not a de Polignac number, because 123055661 - 2² = 123055657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123055663) 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, 50030 + ... + 52431.

It is an arithmetic number, because the mean of its divisors is an integer number (30789831).

Almost surely, 2^123055661 is an apocalyptic number.

It is an amenable number.

123055661 is a deficient number, since it is larger than the sum of its proper divisors (103663).

123055661 is a wasteful number, since it uses less digits than its factorization.

123055661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103662.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 123055661 is about 11093.0456142576. The cubic root of 123055661 is about 497.3939890110.

The spelling of 123055661 in words is "one hundred twenty-three million, fifty-five thousand, six hundred sixty-one".