1366975109 has 4 divisors (see below), whose sum is σ = 1380246816. Its totient is φ = 1353703404.

The previous prime is 1366975091. The next prime is 1366975133. The reversal of 1366975109 is 9015796631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9015796631 = 29 ⋅310889539.

It is a cyclic number.

It is not a de Polignac number, because 1366975109 - 2¹² = 1366971013 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 (1366975199) 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, 6635699 + ... + 6635904.

It is an arithmetic number, because the mean of its divisors is an integer number (345061704).

Almost surely, 2^1366975109 is an apocalyptic number.

It is an amenable number.

1366975109 is a deficient number, since it is larger than the sum of its proper divisors (13271707).

1366975109 is a wasteful number, since it uses less digits than its factorization.

1366975109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13271706.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 1366975109 is about 36972.6264823044. The cubic root of 1366975109 is about 1109.8225263428.

The spelling of 1366975109 in words is "one billion, three hundred sixty-six million, nine hundred seventy-five thousand, one hundred nine".