1200099961 has 2 divisors, whose sum is σ = 1200099962. Its totient is φ = 1200099960.

The previous prime is 1200099959. The next prime is 1200100019. The reversal of 1200099961 is 1699900021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1170939961 + 29160000 = 34219^2 + 5400^2 .

It is an emirp because it is prime and its reverse (1699900021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1200099961 - 2¹ = 1200099959 is a prime.

Together with 1200099959, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1200099961.

It is not a weakly prime, because it can be changed into another prime (1200099161) 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, 600049980 + 600049981.

It is an arithmetic number, because the mean of its divisors is an integer number (600049981).

Almost surely, 2^1200099961 is an apocalyptic number.

It is an amenable number.

1200099961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200099961 is an equidigital number, since it uses as much as digits as its factorization.

1200099961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 1200099961 is about 34642.4589340884. The cubic root of 1200099961 is about 1062.6880751448.

Adding to 1200099961 its reverse (1699900021), we get a palindrome (2899999982).

The spelling of 1200099961 in words is "one billion, two hundred million, ninety-nine thousand, nine hundred sixty-one".