1261520341 has 2 divisors, whose sum is σ = 1261520342. Its totient is φ = 1261520340.

The previous prime is 1261520339. The next prime is 1261520383. The reversal of 1261520341 is 1430251621.

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., 949256100 + 312264241 = 30810^2 + 17671^2 .

It is an emirp because it is prime and its reverse (1430251621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1261520341 - 2¹ = 1261520339 is a prime.

Together with 1261520339, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261520041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630760170 + 630760171.

It is an arithmetic number, because the mean of its divisors is an integer number (630760171).

Almost surely, 2^1261520341 is an apocalyptic number.

It is an amenable number.

1261520341 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261520341 is an equidigital number, since it uses as much as digits as its factorization.

1261520341 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1261520341 is about 35517.8876201837. The cubic root of 1261520341 is about 1080.5165398910.

Adding to 1261520341 its reverse (1430251621), we get a palindrome (2691771962).

The spelling of 1261520341 in words is "one billion, two hundred sixty-one million, five hundred twenty thousand, three hundred forty-one".