1361259539 has 4 divisors (see below), whose sum is σ = 1376554680. Its totient is φ = 1345964400.

The previous prime is 1361259467. The next prime is 1361259553. The reversal of 1361259539 is 9359521631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9359521631 = 101 ⋅92668531.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1361259539 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1361259539.

It is not an unprimeable number, because it can be changed into a prime (1361259839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7647437 + ... + 7647614.

It is an arithmetic number, because the mean of its divisors is an integer number (344138670).

Almost surely, 2^1361259539 is an apocalyptic number.

1361259539 is a deficient number, since it is larger than the sum of its proper divisors (15295141).

1361259539 is an equidigital number, since it uses as much as digits as its factorization.

1361259539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15295140.

The product of its digits is 218700, while the sum is 44.

The square root of 1361259539 is about 36895.2509003530. The cubic root of 1361259539 is about 1108.2735759944.

The spelling of 1361259539 in words is "one billion, three hundred sixty-one million, two hundred fifty-nine thousand, five hundred thirty-nine".