1263416261 has 2 divisors, whose sum is σ = 1263416262. Its totient is φ = 1263416260.

The previous prime is 1263416237. The next prime is 1263416263. The reversal of 1263416261 is 1626143621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1188939361 + 74476900 = 34481^2 + 8630^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263416261 - 2²⁶ = 1196307397 is a prime.

It is a Sophie Germain prime.

Together with 1263416263, it forms a pair of twin primes.

It is a Chen 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 (1263416263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631708130 + 631708131.

It is an arithmetic number, because the mean of its divisors is an integer number (631708131).

Almost surely, 2^1263416261 is an apocalyptic number.

It is an amenable number.

1263416261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263416261 is an equidigital number, since it uses as much as digits as its factorization.

1263416261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 1263416261 is about 35544.5672501439. The cubic root of 1263416261 is about 1081.0575663153.

Adding to 1263416261 its reverse (1626143621), we get a palindrome (2889559882).

The spelling of 1263416261 in words is "one billion, two hundred sixty-three million, four hundred sixteen thousand, two hundred sixty-one".