1261368841 has 2 divisors, whose sum is σ = 1261368842. Its totient is φ = 1261368840.

The previous prime is 1261368821. The next prime is 1261368851. The reversal of 1261368841 is 1488631621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 847042816 + 414326025 = 29104^2 + 20355^2 .

It is an emirp because it is prime and its reverse (1488631621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1261368841 - 2¹¹ = 1261366793 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1261368794 and 1261368803.

It is not a weakly prime, because it can be changed into another prime (1261368821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630684420 + 630684421.

It is an arithmetic number, because the mean of its divisors is an integer number (630684421).

Almost surely, 2^1261368841 is an apocalyptic number.

It is an amenable number.

1261368841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261368841 is an equidigital number, since it uses as much as digits as its factorization.

1261368841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 40.

The square root of 1261368841 is about 35515.7548279633. The cubic root of 1261368841 is about 1080.4732839339.

The spelling of 1261368841 in words is "one billion, two hundred sixty-one million, three hundred sixty-eight thousand, eight hundred forty-one".