1261272049 has 2 divisors, whose sum is σ = 1261272050. Its totient is φ = 1261272048.

The previous prime is 1261272029. The next prime is 1261272059. The reversal of 1261272049 is 9402721621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1197160000 + 64112049 = 34600^2 + 8007^2 .

It is a cyclic number.

It is not a de Polignac number, because 1261272049 - 2²³ = 1252883441 is a prime.

It is not a weakly prime, because it can be changed into another prime (1261272029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630636024 + 630636025.

It is an arithmetic number, because the mean of its divisors is an integer number (630636025).

Almost surely, 2^1261272049 is an apocalyptic number.

It is an amenable number.

1261272049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261272049 is an equidigital number, since it uses as much as digits as its factorization.

1261272049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 1261272049 is about 35514.3921389625. The cubic root of 1261272049 is about 1080.4456462750.

The spelling of 1261272049 in words is "one billion, two hundred sixty-one million, two hundred seventy-two thousand, forty-nine".