1280531 has 4 divisors (see below), whose sum is σ = 1463472. Its totient is φ = 1097592.

The previous prime is 1280519. The next prime is 1280537. The reversal of 1280531 is 1350821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1350821 = 79 ⋅17099.

It is a cyclic number.

It is not a de Polignac number, because 1280531 - 2¹⁰ = 1279507 is a prime.

It is a super-2 number, since 2×1280531² = 3279519283922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1280537) 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, 91460 + ... + 91473.

It is an arithmetic number, because the mean of its divisors is an integer number (365868).

2^1280531 is an apocalyptic number.

1280531 is a deficient number, since it is larger than the sum of its proper divisors (182941).

1280531 is an equidigital number, since it uses as much as digits as its factorization.

1280531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182940.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1280531 is about 1131.6054966286. The cubic root of 1280531 is about 108.5917167105.

The spelling of 1280531 in words is "one million, two hundred eighty thousand, five hundred thirty-one".