1201324781 has 2 divisors, whose sum is σ = 1201324782. Its totient is φ = 1201324780.

The previous prime is 1201324777. The next prime is 1201324793. The reversal of 1201324781 is 1874231021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 710702281 + 490622500 = 26659^2 + 22150^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201324781 - 2² = 1201324777 is a prime.

It is a super-2 number, since 2×1201324781² = 2886362458889395922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201324981) 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, 600662390 + 600662391.

It is an arithmetic number, because the mean of its divisors is an integer number (600662391).

Almost surely, 2^1201324781 is an apocalyptic number.

It is an amenable number.

1201324781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201324781 is an equidigital number, since it uses as much as digits as its factorization.

1201324781 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 1201324781 is about 34660.1324434861. The cubic root of 1201324781 is about 1063.0494781104.

The spelling of 1201324781 in words is "one billion, two hundred one million, three hundred twenty-four thousand, seven hundred eighty-one".