1204853561 has 2 divisors, whose sum is σ = 1204853562. Its totient is φ = 1204853560.

The previous prime is 1204853557. The next prime is 1204853581. The reversal of 1204853561 is 1653584021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1199929600 + 4923961 = 34640^2 + 2219^2 .

It is a cyclic number.

It is not a de Polignac number, because 1204853561 - 2² = 1204853557 is a prime.

It is not a weakly prime, because it can be changed into another prime (1204853581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602426780 + 602426781.

It is an arithmetic number, because the mean of its divisors is an integer number (602426781).

Almost surely, 2^1204853561 is an apocalyptic number.

It is an amenable number.

1204853561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1204853561 is an equidigital number, since it uses as much as digits as its factorization.

1204853561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 1204853561 is about 34711.0005761862. Note that the first 3 decimals coincide. The cubic root of 1204853561 is about 1064.0893303299.

The spelling of 1204853561 in words is "one billion, two hundred four million, eight hundred fifty-three thousand, five hundred sixty-one".