1361159887 has 4 divisors (see below), whose sum is σ = 1363226040. Its totient is φ = 1359093736.

The previous prime is 1361159869. The next prime is 1361159923. The reversal of 1361159887 is 7889511631.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1361159887 - 2¹¹ = 1361157839 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 1361159887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1361159827) 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, 1032088 + ... + 1033405.

It is an arithmetic number, because the mean of its divisors is an integer number (340806510).

Almost surely, 2^1361159887 is an apocalyptic number.

1361159887 is a deficient number, since it is larger than the sum of its proper divisors (2066153).

1361159887 is an equidigital number, since it uses as much as digits as its factorization.

1361159887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2066152.

The product of its digits is 362880, while the sum is 49.

The square root of 1361159887 is about 36893.9004037253. The cubic root of 1361159887 is about 1108.2465313419.

The spelling of 1361159887 in words is "one billion, three hundred sixty-one million, one hundred fifty-nine thousand, eight hundred eighty-seven".