1261513063 has 2 divisors, whose sum is σ = 1261513064. Its totient is φ = 1261513062.

The previous prime is 1261513013. The next prime is 1261513087. The reversal of 1261513063 is 3603151621.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261513063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261513013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630756531 + 630756532.

It is an arithmetic number, because the mean of its divisors is an integer number (630756532).

Almost surely, 2^1261513063 is an apocalyptic number.

1261513063 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261513063 is an equidigital number, since it uses as much as digits as its factorization.

1261513063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1261513063 is about 35517.7851646186. The cubic root of 1261513063 is about 1080.5144619711.

Adding to 1261513063 its reverse (3603151621), we get a palindrome (4864664684).

The spelling of 1261513063 in words is "one billion, two hundred sixty-one million, five hundred thirteen thousand, sixty-three".