122720077 has 2 divisors, whose sum is σ = 122720078. Its totient is φ = 122720076.

The previous prime is 122720063. The next prime is 122720089. The reversal of 122720077 is 770027221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117202276 + 5517801 = 10826^2 + 2349^2 .

It is a cyclic number.

It is not a de Polignac number, because 122720077 - 2¹⁵ = 122687309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122720027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61360038 + 61360039.

It is an arithmetic number, because the mean of its divisors is an integer number (61360039).

Almost surely, 2^122720077 is an apocalyptic number.

It is an amenable number.

122720077 is a deficient number, since it is larger than the sum of its proper divisors (1).

122720077 is an equidigital number, since it uses as much as digits as its factorization.

122720077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2744, while the sum is 28.

The square root of 122720077 is about 11077.9094146865. The cubic root of 122720077 is about 496.9414311295.

Adding to 122720077 its reverse (770027221), we get a palindrome (892747298).

The spelling of 122720077 in words is "one hundred twenty-two million, seven hundred twenty thousand, seventy-seven".