1200271861 has 2 divisors, whose sum is σ = 1200271862. Its totient is φ = 1200271860.

The previous prime is 1200271817. The next prime is 1200271903. The reversal of 1200271861 is 1681720021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1011621636 + 188650225 = 31806^2 + 13735^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200271861 - 2¹¹ = 1200269813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200271561) 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, 600135930 + 600135931.

It is an arithmetic number, because the mean of its divisors is an integer number (600135931).

Almost surely, 2^1200271861 is an apocalyptic number.

It is an amenable number.

1200271861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200271861 is an equidigital number, since it uses as much as digits as its factorization.

1200271861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 1200271861 is about 34644.9399046960. The cubic root of 1200271861 is about 1062.7388118514.

Adding to 1200271861 its reverse (1681720021), we get a palindrome (2881991882).

The spelling of 1200271861 in words is "one billion, two hundred million, two hundred seventy-one thousand, eight hundred sixty-one".