1261275473 has 2 divisors, whose sum is σ = 1261275474. Its totient is φ = 1261275472.

The previous prime is 1261275401. The next prime is 1261275539. The reversal of 1261275473 is 3745721621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1228362304 + 32913169 = 35048^2 + 5737^2 .

It is a cyclic number.

It is not a de Polignac number, because 1261275473 - 2¹² = 1261271377 is a prime.

It is not a weakly prime, because it can be changed into another prime (1261275073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630637736 + 630637737.

It is an arithmetic number, because the mean of its divisors is an integer number (630637737).

Almost surely, 2^1261275473 is an apocalyptic number.

It is an amenable number.

1261275473 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261275473 is an equidigital number, since it uses as much as digits as its factorization.

1261275473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 38.

The square root of 1261275473 is about 35514.4403447386. The cubic root of 1261275473 is about 1080.4466239765.

The spelling of 1261275473 in words is "one billion, two hundred sixty-one million, two hundred seventy-five thousand, four hundred seventy-three".