1211361 has 4 divisors (see below), whose sum is σ = 1615152. Its totient is φ = 807572.

The previous prime is 1211339. The next prime is 1211381. The reversal of 1211361 is 1631121.

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: 1631121 = 3 ⋅543707.

It is a cyclic number.

It is not a de Polignac number, because 1211361 - 2¹⁹ = 687073 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211361.

It is not an unprimeable number, because it can be changed into a prime (1211311) 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, 201891 + ... + 201896.

It is an arithmetic number, because the mean of its divisors is an integer number (403788).

2^1211361 is an apocalyptic number.

It is an amenable number.

1211361 is a deficient number, since it is larger than the sum of its proper divisors (403791).

1211361 is an equidigital number, since it uses as much as digits as its factorization.

1211361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403790.

The product of its digits is 36, while the sum is 15.

The square root of 1211361 is about 1100.6184625019. The cubic root of 1211361 is about 106.6001614515.

Subtracting from 1211361 its sum of digits (15), we obtain a triangular number (1211346 = T₁₅₅₆).

Adding to 1211361 its reverse (1631121), we get a palindrome (2842482).

The spelling of 1211361 in words is "one million, two hundred eleven thousand, three hundred sixty-one".