1221740077 has 2 divisors, whose sum is σ = 1221740078. Its totient is φ = 1221740076.

The previous prime is 1221740063. The next prime is 1221740089. The reversal of 1221740077 is 7700471221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1196398921 + 25341156 = 34589^2 + 5034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221740077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221740027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610870038 + 610870039.

It is an arithmetic number, because the mean of its divisors is an integer number (610870039).

Almost surely, 2^1221740077 is an apocalyptic number.

It is an amenable number.

1221740077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221740077 is an equidigital number, since it uses as much as digits as its factorization.

1221740077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5488, while the sum is 31.

The square root of 1221740077 is about 34953.3986473419. The cubic root of 1221740077 is about 1069.0375008393.

The spelling of 1221740077 in words is "one billion, two hundred twenty-one million, seven hundred forty thousand, seventy-seven".