1261513013 has 2 divisors, whose sum is σ = 1261513014. Its totient is φ = 1261513012.

The previous prime is 1261512991. The next prime is 1261513063. The reversal of 1261513013 is 3103151621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1038966289 + 222546724 = 32233^2 + 14918^2 .

It is a cyclic number.

It is not a de Polignac number, because 1261513013 - 2⁶ = 1261512949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1261513013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261513063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630756506 + 630756507.

It is an arithmetic number, because the mean of its divisors is an integer number (630756507).

Almost surely, 2^1261513013 is an apocalyptic number.

It is an amenable number.

1261513013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261513013 is an equidigital number, since it uses as much as digits as its factorization.

1261513013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 1261513013 is about 35517.7844607459. The cubic root of 1261513013 is about 1080.5144476958.

Adding to 1261513013 its reverse (3103151621), we get a palindrome (4364664634).

The spelling of 1261513013 in words is "one billion, two hundred sixty-one million, five hundred thirteen thousand, thirteen".