122478809 has 2 divisors, whose sum is σ = 122478810. Its totient is φ = 122478808.

The previous prime is 122478787. The next prime is 122478817. The reversal of 122478809 is 908874221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119137225 + 3341584 = 10915^2 + 1828^2 .

It is a cyclic number.

It is not a de Polignac number, because 122478809 - 2¹² = 122474713 is a prime.

It is not a weakly prime, because it can be changed into another prime (122478859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61239404 + 61239405.

It is an arithmetic number, because the mean of its divisors is an integer number (61239405).

Almost surely, 2^122478809 is an apocalyptic number.

It is an amenable number.

122478809 is a deficient number, since it is larger than the sum of its proper divisors (1).

122478809 is an equidigital number, since it uses as much as digits as its factorization.

122478809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 122478809 is about 11067.0144573864. The cubic root of 122478809 is about 496.6155547501.

The spelling of 122478809 in words is "one hundred twenty-two million, four hundred seventy-eight thousand, eight hundred nine".