1365605881 has 2 divisors, whose sum is σ = 1365605882. Its totient is φ = 1365605880.

The previous prime is 1365605863. The next prime is 1365605957. The reversal of 1365605881 is 1885065631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 958212025 + 407393856 = 30955^2 + 20184^2 .

It is a cyclic number.

It is not a de Polignac number, because 1365605881 - 2⁵ = 1365605849 is a prime.

It is a super-2 number, since 2×1365605881² = 3729758844443572322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1365605861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 682802940 + 682802941.

It is an arithmetic number, because the mean of its divisors is an integer number (682802941).

Almost surely, 2^1365605881 is an apocalyptic number.

It is an amenable number.

1365605881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1365605881 is an equidigital number, since it uses as much as digits as its factorization.

1365605881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 43.

The square root of 1365605881 is about 36954.1050629020. The cubic root of 1365605881 is about 1109.4518520175.

The spelling of 1365605881 in words is "one billion, three hundred sixty-five million, six hundred five thousand, eight hundred eighty-one".