1531265 has 4 divisors (see below), whose sum is σ = 1837524. Its totient is φ = 1225008.

The previous prime is 1531253. The next prime is 1531279. The reversal of 1531265 is 5621351.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5621351 = 2221 ⋅2531.

It can be written as a sum of positive squares in 2 ways, for example, as 303601 + 1227664 = 551^2 + 1108^2 .

It is a cyclic number.

It is not a de Polignac number, because 1531265 - 2¹⁶ = 1465729 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1531265.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 153122 + ... + 153131.

It is an arithmetic number, because the mean of its divisors is an integer number (459381).

2^1531265 is an apocalyptic number.

It is an amenable number.

1531265 is a deficient number, since it is larger than the sum of its proper divisors (306259).

1531265 is an equidigital number, since it uses as much as digits as its factorization.

1531265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306258.

The product of its digits is 900, while the sum is 23.

The square root of 1531265 is about 1237.4429279769. The cubic root of 1531265 is about 115.2612836624.

The spelling of 1531265 in words is "one million, five hundred thirty-one thousand, two hundred sixty-five".