1280440531 has 2 divisors, whose sum is σ = 1280440532. Its totient is φ = 1280440530.

The previous prime is 1280440477. The next prime is 1280440559. The reversal of 1280440531 is 1350440821.

It is an a-pointer prime, because the next prime (1280440559) can be obtained adding 1280440531 to its sum of digits (28).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1280440531 - 2¹¹ = 1280438483 is a prime.

It is a super-2 number, since 2×1280440531² = 3279055906855123922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1280440531.

It is not a weakly prime, because it can be changed into another prime (1280440831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640220265 + 640220266.

It is an arithmetic number, because the mean of its divisors is an integer number (640220266).

Almost surely, 2^1280440531 is an apocalyptic number.

1280440531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280440531 is an equidigital number, since it uses as much as digits as its factorization.

1280440531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 1280440531 is about 35783.2437182545. The cubic root of 1280440531 is about 1085.8915932995.

It can be divided in two parts, 12804 and 40531, that added together give a palindrome (53335).

The spelling of 1280440531 in words is "one billion, two hundred eighty million, four hundred forty thousand, five hundred thirty-one".