122780621 has 2 divisors, whose sum is σ = 122780622. Its totient is φ = 122780620.

The previous prime is 122780597. The next prime is 122780627. The reversal of 122780621 is 126087221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63027721 + 59752900 = 7939^2 + 7730^2 .

It is a cyclic number.

It is not a de Polignac number, because 122780621 - 2¹⁴ = 122764237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122780627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61390310 + 61390311.

It is an arithmetic number, because the mean of its divisors is an integer number (61390311).

Almost surely, 2^122780621 is an apocalyptic number.

It is an amenable number.

122780621 is a deficient number, since it is larger than the sum of its proper divisors (1).

122780621 is an equidigital number, since it uses as much as digits as its factorization.

122780621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 122780621 is about 11080.6417232938. The cubic root of 122780621 is about 497.0231397798.

The spelling of 122780621 in words is "one hundred twenty-two million, seven hundred eighty thousand, six hundred twenty-one".