1361956709 has 4 divisors (see below), whose sum is σ = 1362114540. Its totient is φ = 1361798880.

The previous prime is 1361956703. The next prime is 1361956721. The reversal of 1361956709 is 9076591631.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 631768225 + 730188484 = 25135^2 + 27022^2 .

It is a cyclic number.

It is not a de Polignac number, because 1361956709 - 2¹⁶ = 1361891173 is a prime.

It is a super-2 number, since 2×1361956709² = 3709852154380221362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1361956703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65174 + ... + 83495.

It is an arithmetic number, because the mean of its divisors is an integer number (340528635).

Almost surely, 2^1361956709 is an apocalyptic number.

It is an amenable number.

1361956709 is a deficient number, since it is larger than the sum of its proper divisors (157831).

1361956709 is an equidigital number, since it uses as much as digits as its factorization.

1361956709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157830.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 1361956709 is about 36904.6976549057. The cubic root of 1361956709 is about 1108.4627447260.

The spelling of 1361956709 in words is "one billion, three hundred sixty-one million, nine hundred fifty-six thousand, seven hundred nine".