1208949961 has 2 divisors, whose sum is σ = 1208949962. Its totient is φ = 1208949960.

The previous prime is 1208949913. The next prime is 1208949979. The reversal of 1208949961 is 1699498021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1195845561 + 13104400 = 34581^2 + 3620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1208949961 is a prime.

It is not a weakly prime, because it can be changed into another prime (1208949991) 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, 604474980 + 604474981.

It is an arithmetic number, because the mean of its divisors is an integer number (604474981).

Almost surely, 2^1208949961 is an apocalyptic number.

It is an amenable number.

1208949961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1208949961 is an equidigital number, since it uses as much as digits as its factorization.

1208949961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 49.

The square root of 1208949961 is about 34769.9577365288. The cubic root of 1208949961 is about 1065.2939040584.

The spelling of 1208949961 in words is "one billion, two hundred eight million, nine hundred forty-nine thousand, nine hundred sixty-one".