1294475561 has 2 divisors, whose sum is σ = 1294475562. Its totient is φ = 1294475560.

The previous prime is 1294475549. The next prime is 1294475597. The reversal of 1294475561 is 1655744921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1214104336 + 80371225 = 34844^2 + 8965^2 .

It is a cyclic number.

It is not a de Polignac number, because 1294475561 - 2²² = 1290281257 is a prime.

It is not a weakly prime, because it can be changed into another prime (1294475521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 647237780 + 647237781.

It is an arithmetic number, because the mean of its divisors is an integer number (647237781).

Almost surely, 2^1294475561 is an apocalyptic number.

It is an amenable number.

1294475561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1294475561 is an equidigital number, since it uses as much as digits as its factorization.

1294475561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 44.

The square root of 1294475561 is about 35978.8210062531. The cubic root of 1294475561 is about 1089.8447050312.

The spelling of 1294475561 in words is "one billion, two hundred ninety-four million, four hundred seventy-five thousand, five hundred sixty-one".