1201388777 has 2 divisors, whose sum is σ = 1201388778. Its totient is φ = 1201388776.

The previous prime is 1201388743. The next prime is 1201388801. The reversal of 1201388777 is 7778831021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1173679081 + 27709696 = 34259^2 + 5264^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201388777 - 2²⁰ = 1200340201 is a prime.

It is not a weakly prime, because it can be changed into another prime (1201388707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600694388 + 600694389.

It is an arithmetic number, because the mean of its divisors is an integer number (600694389).

Almost surely, 2^1201388777 is an apocalyptic number.

It is an amenable number.

1201388777 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201388777 is an equidigital number, since it uses as much as digits as its factorization.

1201388777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 131712, while the sum is 44.

The square root of 1201388777 is about 34661.0556244324. The cubic root of 1201388777 is about 1063.0683544120.

The spelling of 1201388777 in words is "one billion, two hundred one million, three hundred eighty-eight thousand, seven hundred seventy-seven".