123617261 has 4 divisors (see below), whose sum is σ = 123654300. Its totient is φ = 123580224.

The previous prime is 123617237. The next prime is 123617269. The reversal of 123617261 is 162716321.

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 59521225 + 64096036 = 7715^2 + 8006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123617261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123617269) 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, 12956 + ... + 20373.

It is an arithmetic number, because the mean of its divisors is an integer number (30913575).

Almost surely, 2^123617261 is an apocalyptic number.

It is an amenable number.

123617261 is a deficient number, since it is larger than the sum of its proper divisors (37039).

123617261 is an equidigital number, since it uses as much as digits as its factorization.

123617261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37038.

The product of its digits is 3024, while the sum is 29.

The square root of 123617261 is about 11118.3299555284. The cubic root of 123617261 is about 498.1495078062.

The spelling of 123617261 in words is "one hundred twenty-three million, six hundred seventeen thousand, two hundred sixty-one".