122776639 has 2 divisors, whose sum is σ = 122776640. Its totient is φ = 122776638.

The previous prime is 122776631. The next prime is 122776663. The reversal of 122776639 is 936677221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 122776639 - 2³ = 122776631 is a prime.

It is equal to p_6990658 and since 122776639 and 6990658 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 122776595 and 122776604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122776631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61388319 + 61388320.

It is an arithmetic number, because the mean of its divisors is an integer number (61388320).

Almost surely, 2^122776639 is an apocalyptic number.

122776639 is a deficient number, since it is larger than the sum of its proper divisors (1).

122776639 is an equidigital number, since it uses as much as digits as its factorization.

122776639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 43.

The square root of 122776639 is about 11080.4620391029. The cubic root of 122776639 is about 497.0177665987.

The spelling of 122776639 in words is "one hundred twenty-two million, seven hundred seventy-six thousand, six hundred thirty-nine".