123015601 has 2 divisors, whose sum is σ = 123015602. Its totient is φ = 123015600.

The previous prime is 123015521. The next prime is 123015617. The reversal of 123015601 is 106510321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118919025 + 4096576 = 10905^2 + 2024^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123015601 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123015401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61507800 + 61507801.

It is an arithmetic number, because the mean of its divisors is an integer number (61507801).

Almost surely, 2^123015601 is an apocalyptic number.

It is an amenable number.

123015601 is a deficient number, since it is larger than the sum of its proper divisors (1).

123015601 is an equidigital number, since it uses as much as digits as its factorization.

123015601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 123015601 is about 11091.2398315067. The cubic root of 123015601 is about 497.3400086533.

Adding to 123015601 its reverse (106510321), we get a palindrome (229525922).

The spelling of 123015601 in words is "one hundred twenty-three million, fifteen thousand, six hundred one".