122880781 has 2 divisors, whose sum is σ = 122880782. Its totient is φ = 122880780.

The previous prime is 122880763. The next prime is 122880829. The reversal of 122880781 is 187088221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116424100 + 6456681 = 10790^2 + 2541^2 .

It is a cyclic number.

It is not a de Polignac number, because 122880781 - 2²³ = 114492173 is a prime.

It is a super-2 number, since 2×122880781² = 30199372678339922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 122880781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122880721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61440390 + 61440391.

It is an arithmetic number, because the mean of its divisors is an integer number (61440391).

Almost surely, 2^122880781 is an apocalyptic number.

It is an amenable number.

122880781 is a deficient number, since it is larger than the sum of its proper divisors (1).

122880781 is an equidigital number, since it uses as much as digits as its factorization.

122880781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14336, while the sum is 37.

The square root of 122880781 is about 11085.1603957724. The cubic root of 122880781 is about 497.1582542267.

The spelling of 122880781 in words is "one hundred twenty-two million, eight hundred eighty thousand, seven hundred eighty-one".