9785261261 has 2 divisors, whose sum is σ = 9785261262. Its totient is φ = 9785261260.

The previous prime is 9785261221. The next prime is 9785261341. The reversal of 9785261261 is 1621625879.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9722946025 + 62315236 = 98605^2 + 7894^2 .

It is a cyclic number.

It is not a de Polignac number, because 9785261261 - 2¹⁰ = 9785260237 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9785261201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4892630630 + 4892630631.

It is an arithmetic number, because the mean of its divisors is an integer number (4892630631).

Almost surely, 2^9785261261 is an apocalyptic number.

It is an amenable number.

9785261261 is a deficient number, since it is larger than the sum of its proper divisors (1).

9785261261 is an equidigital number, since it uses as much as digits as its factorization.

9785261261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The square root of 9785261261 is about 98920.4794822589. The cubic root of 9785261261 is about 2138.9016156380.

The spelling of 9785261261 in words is "nine billion, seven hundred eighty-five million, two hundred sixty-one thousand, two hundred sixty-one".