123780071 has 2 divisors, whose sum is σ = 123780072. Its totient is φ = 123780070.

The previous prime is 123780067. The next prime is 123780109. The reversal of 123780071 is 170087321.

It is a weak prime.

It is an emirp because it is prime and its reverse (170087321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123780071 - 2² = 123780067 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123780011) 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, 61890035 + 61890036.

It is an arithmetic number, because the mean of its divisors is an integer number (61890036).

Almost surely, 2^123780071 is an apocalyptic number.

123780071 is a deficient number, since it is larger than the sum of its proper divisors (1).

123780071 is an equidigital number, since it uses as much as digits as its factorization.

123780071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 123780071 is about 11125.6492394826. The cubic root of 123780071 is about 498.3681076492.

The spelling of 123780071 in words is "one hundred twenty-three million, seven hundred eighty thousand, seventy-one".