1361261129 has 2 divisors, whose sum is σ = 1361261130. Its totient is φ = 1361261128.

The previous prime is 1361261123. The next prime is 1361261147. The reversal of 1361261129 is 9211621631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1080765625 + 280495504 = 32875^2 + 16748^2 .

It is an emirp because it is prime and its reverse (9211621631) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1361261129 is a prime.

It is a super-2 number, since 2×1361261129² = 3706063722652709282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1361261095 and 1361261104.

It is not a weakly prime, because it can be changed into another prime (1361261123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 680630564 + 680630565.

It is an arithmetic number, because the mean of its divisors is an integer number (680630565).

Almost surely, 2^1361261129 is an apocalyptic number.

It is an amenable number.

1361261129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1361261129 is an equidigital number, since it uses as much as digits as its factorization.

1361261129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 32.

The square root of 1361261129 is about 36895.2724478354. The cubic root of 1361261129 is about 1108.2740074953.

The spelling of 1361261129 in words is "one billion, three hundred sixty-one million, two hundred sixty-one thousand, one hundred twenty-nine".