1369666081 has 27 divisors (see below), whose sum is σ = 1697980467. Its totient is φ = 1101387840.

The previous prime is 1369666079. The next prime is 1369666097. The reversal of 1369666081 is 1806669631.

The square root of 1369666081 is 37009.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1066349025 + 303317056 = 32655^2 + 17416^2 .

It is not a de Polignac number, because 1369666081 - 2¹ = 1369666079 is a prime.

It is a super-2 number, since 2×1369666081² = 3751970346883797122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1369666981) 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 26 ways as a sum of consecutive naturals, for example, 4403916 + ... + 4404226.

Almost surely, 2^1369666081 is an apocalyptic number.

1369666081 is the 37009-th square number.

1369666081 is the 18505-th centered octagonal number.

It is an amenable number.

1369666081 is a deficient number, since it is larger than the sum of its proper divisors (328314386).

1369666081 is an frugal number, since it uses more digits than its factorization.

1369666081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 46.

The cubic root of 1369666081 is about 1110.5502995998.

The spelling of 1369666081 in words is "one billion, three hundred sixty-nine million, six hundred sixty-six thousand, eighty-one".