123015917 has 2 divisors, whose sum is σ = 123015918. Its totient is φ = 123015916.

The previous prime is 123015901. The next prime is 123015923. The reversal of 123015917 is 719510321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120538441 + 2477476 = 10979^2 + 1574^2 .

It is a cyclic number.

It is not a de Polignac number, because 123015917 - 2⁴ = 123015901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123015917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123015947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61507958 + 61507959.

It is an arithmetic number, because the mean of its divisors is an integer number (61507959).

Almost surely, 2^123015917 is an apocalyptic number.

It is an amenable number.

123015917 is a deficient number, since it is larger than the sum of its proper divisors (1).

123015917 is an equidigital number, since it uses as much as digits as its factorization.

123015917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1890, while the sum is 29.

The square root of 123015917 is about 11091.2540769743. The cubic root of 123015917 is about 497.3404345053.

The spelling of 123015917 in words is "one hundred twenty-three million, fifteen thousand, nine hundred seventeen".