1369376221 has 4 divisors (see below), whose sum is σ = 1369541692. Its totient is φ = 1369210752.

The previous prime is 1369376209. The next prime is 1369376249. The reversal of 1369376221 is 1226739631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1226739631 = 13 ⋅94364587.

It can be written as a sum of positive squares in 2 ways, for example, as 576672196 + 792704025 = 24014^2 + 28155^2 .

It is a cyclic number.

It is not a de Polignac number, because 1369376221 - 2¹⁷ = 1369245149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1369376291) 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, 69630 + ... + 87103.

It is an arithmetic number, because the mean of its divisors is an integer number (342385423).

Almost surely, 2^1369376221 is an apocalyptic number.

It is an amenable number.

1369376221 is a deficient number, since it is larger than the sum of its proper divisors (165471).

1369376221 is an equidigital number, since it uses as much as digits as its factorization.

1369376221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165470.

The product of its digits is 81648, while the sum is 40.

The square root of 1369376221 is about 37005.0837183217. The cubic root of 1369376221 is about 1110.4719528102.

The spelling of 1369376221 in words is "one billion, three hundred sixty-nine million, three hundred seventy-six thousand, two hundred twenty-one".