1231361 has 8 divisors (see below), whose sum is σ = 1317384. Its totient is φ = 1146880.

The previous prime is 1231357. The next prime is 1231379. The reversal of 1231361 is 1631321.

It can be written as a sum of positive squares in 4 ways, for example, as 231361 + 1000000 = 481^2 + 1000^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231361 - 2² = 1231357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1601 + ... + 2241.

It is an arithmetic number, because the mean of its divisors is an integer number (164673).

2^1231361 is an apocalyptic number.

1231361 is the 641-st octagonal number.

It is an amenable number.

1231361 is a deficient number, since it is larger than the sum of its proper divisors (86023).

1231361 is a wasteful number, since it uses less digits than its factorization.

1231361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771.

The product of its digits is 108, while the sum is 17.

The square root of 1231361 is about 1109.6670671873. The cubic root of 1231361 is about 107.1836308729.

Adding to 1231361 its reverse (1631321), we get a palindrome (2862682).

The spelling of 1231361 in words is "one million, two hundred thirty-one thousand, three hundred sixty-one".