100865123 has 2 divisors, whose sum is σ = 100865124. Its totient is φ = 100865122.

The previous prime is 100865101. The next prime is 100865137. The reversal of 100865123 is 321568001.

It is a strong prime.

It is an emirp because it is prime and its reverse (321568001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100865123 - 2¹² = 100861027 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 100865092 and 100865101.

It is not a weakly prime, because it can be changed into another prime (100865173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50432561 + 50432562.

It is an arithmetic number, because the mean of its divisors is an integer number (50432562).

Almost surely, 2^100865123 is an apocalyptic number.

100865123 is a deficient number, since it is larger than the sum of its proper divisors (1).

100865123 is an equidigital number, since it uses as much as digits as its factorization.

100865123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 100865123 is about 10043.1629977811. The cubic root of 100865123 is about 465.4935569583.

The spelling of 100865123 in words is "one hundred million, eight hundred sixty-five thousand, one hundred twenty-three".