1231533 has 12 divisors (see below), whose sum is σ = 1790620. Its totient is φ = 815616.

The previous prime is 1231513. The next prime is 1231547. The reversal of 1231533 is 3351321.

It can be written as a sum of positive squares in 2 ways, for example, as 227529 + 1004004 = 477^2 + 1002^2 .

It is not a de Polignac number, because 1231533 - 2⁶ = 1231469 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1383 + ... + 2091.

2^1231533 is an apocalyptic number.

It is an amenable number.

1231533 is a deficient number, since it is larger than the sum of its proper divisors (559087).

1231533 is a wasteful number, since it uses less digits than its factorization.

1231533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908 (or 905 counting only the distinct ones).

The product of its digits is 270, while the sum is 18.

The square root of 1231533 is about 1109.7445652041. The cubic root of 1231533 is about 107.1886212119.

Adding to 1231533 its reverse (3351321), we get a palindrome (4582854).

It can be divided in two parts, 1231 and 533, that added together give a square (1764 = 42²).

The spelling of 1231533 in words is "one million, two hundred thirty-one thousand, five hundred thirty-three".