1366261 has 4 divisors (see below), whose sum is σ = 1471372. Its totient is φ = 1261152.

The previous prime is 1366241. The next prime is 1366279. The reversal of 1366261 is 1626631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1626631 = 37 ⋅43963.

It can be written as a sum of positive squares in 2 ways, for example, as 902500 + 463761 = 950^2 + 681^2 .

It is a cyclic number.

It is not a de Polignac number, because 1366261 - 2¹¹ = 1364213 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 (1366241) 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, 52536 + ... + 52561.

It is an arithmetic number, because the mean of its divisors is an integer number (367843).

2^1366261 is an apocalyptic number.

It is an amenable number.

1366261 is a deficient number, since it is larger than the sum of its proper divisors (105111).

1366261 is a wasteful number, since it uses less digits than its factorization.

1366261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105110.

The product of its digits is 1296, while the sum is 25.

The square root of 1366261 is about 1168.8716781580. The cubic root of 1366261 is about 110.9629235259.

The spelling of 1366261 in words is "one million, three hundred sixty-six thousand, two hundred sixty-one".