122456779 has 2 divisors, whose sum is σ = 122456780. Its totient is φ = 122456778.

The previous prime is 122456773. The next prime is 122456809. The reversal of 122456779 is 977654221.

It is a weak prime.

It is an emirp because it is prime and its reverse (977654221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 122456779 - 2⁹ = 122456267 is a prime.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (122456773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61228389 + 61228390.

It is an arithmetic number, because the mean of its divisors is an integer number (61228390).

Almost surely, 2^122456779 is an apocalyptic number.

122456779 is a deficient number, since it is larger than the sum of its proper divisors (1).

122456779 is an equidigital number, since it uses as much as digits as its factorization.

122456779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 43.

The square root of 122456779 is about 11066.0191125806. The cubic root of 122456779 is about 496.5857779074.

The spelling of 122456779 in words is "one hundred twenty-two million, four hundred fifty-six thousand, seven hundred seventy-nine".