123778201 has 2 divisors, whose sum is σ = 123778202. Its totient is φ = 123778200.

The previous prime is 123778163. The next prime is 123778219. The reversal of 123778201 is 102877321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95942025 + 27836176 = 9795^2 + 5276^2 .

It is a cyclic number.

It is not a de Polignac number, because 123778201 - 2⁷ = 123778073 is a prime.

It is not a weakly prime, because it can be changed into another prime (123778231) 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, 61889100 + 61889101.

It is an arithmetic number, because the mean of its divisors is an integer number (61889101).

Almost surely, 2^123778201 is an apocalyptic number.

It is an amenable number.

123778201 is a deficient number, since it is larger than the sum of its proper divisors (1).

123778201 is an equidigital number, since it uses as much as digits as its factorization.

123778201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 123778201 is about 11125.5651991258. The cubic root of 123778201 is about 498.3655979478.

The spelling of 123778201 in words is "one hundred twenty-three million, seven hundred seventy-eight thousand, two hundred one".