1231365 has 16 divisors (see below), whose sum is σ = 1991808. Its totient is φ = 649536.

The previous prime is 1231357. The next prime is 1231379. The reversal of 1231365 is 5631321.

1231365 = 253² + 254² + ... + 270².

It is not a de Polignac number, because 1231365 - 2³ = 1231357 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1147 + ... + 1943.

It is an arithmetic number, because the mean of its divisors is an integer number (124488).

2^1231365 is an apocalyptic number.

1231365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1231365 is a deficient number, since it is larger than the sum of its proper divisors (760443).

1231365 is a wasteful number, since it uses less digits than its factorization.

1231365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908.

The product of its digits is 540, while the sum is 21.

The square root of 1231365 is about 1109.6688695282. The cubic root of 1231365 is about 107.1837469326.

Adding to 1231365 its reverse (5631321), we get a palindrome (6862686).

It can be divided in two parts, 1231 and 365, that added together give a triangular number (1596 = T₅₆).

The spelling of 1231365 in words is "one million, two hundred thirty-one thousand, three hundred sixty-five".