1047665261 has 2 divisors, whose sum is σ = 1047665262. Its totient is φ = 1047665260.

The previous prime is 1047665231. The next prime is 1047665309. The reversal of 1047665261 is 1625667401.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1046522500 + 1142761 = 32350^2 + 1069^2 .

It is an emirp because it is prime and its reverse (1625667401) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1047665261 - 2⁶ = 1047665197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1047665231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 523832630 + 523832631.

It is an arithmetic number, because the mean of its divisors is an integer number (523832631).

Almost surely, 2^1047665261 is an apocalyptic number.

It is an amenable number.

1047665261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1047665261 is an equidigital number, since it uses as much as digits as its factorization.

1047665261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 1047665261 is about 32367.6576384514. The cubic root of 1047665261 is about 1015.6424580081.

The spelling of 1047665261 in words is "one billion, forty-seven million, six hundred sixty-five thousand, two hundred sixty-one".