215860123 has 2 divisors, whose sum is σ = 215860124. Its totient is φ = 215860122.

The previous prime is 215860111. The next prime is 215860133. The reversal of 215860123 is 321068512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215860123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215860091 and 215860100.

It is not a weakly prime, because it can be changed into another prime (215860133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107930061 + 107930062.

It is an arithmetic number, because the mean of its divisors is an integer number (107930062).

Almost surely, 2^215860123 is an apocalyptic number.

215860123 is a deficient number, since it is larger than the sum of its proper divisors (1).

215860123 is an equidigital number, since it uses as much as digits as its factorization.

215860123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 215860123 is about 14692.1789738623. The cubic root of 215860123 is about 599.8704562920.

The spelling of 215860123 in words is "two hundred fifteen million, eight hundred sixty thousand, one hundred twenty-three".