1361091813 has 8 divisors (see below), whose sum is σ = 1817980800. Its totient is φ = 905798688.

The previous prime is 1361091779. The next prime is 1361091821. The reversal of 1361091813 is 3181901631.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1361091813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1361091113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396973 + ... + 400386.

It is an arithmetic number, because the mean of its divisors is an integer number (227247600).

Almost surely, 2^1361091813 is an apocalyptic number.

It is an amenable number.

1361091813 is a deficient number, since it is larger than the sum of its proper divisors (456888987).

1361091813 is an equidigital number, since it uses as much as digits as its factorization.

1361091813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797931.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 1361091813 is about 36892.9778277655. The cubic root of 1361091813 is about 1108.2280559145.

The spelling of 1361091813 in words is "one billion, three hundred sixty-one million, ninety-one thousand, eight hundred thirteen".