1280431 has 2 divisors, whose sum is σ = 1280432. Its totient is φ = 1280430.

The previous prime is 1280417. The next prime is 1280453. The reversal of 1280431 is 1340821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1280431 - 2⁵ = 1280399 is a prime.

It is a super-2 number, since 2×1280431² = 3279007091522, which contains 22 as substring.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 1280399 and 1280408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1280401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640215 + 640216.

It is an arithmetic number, because the mean of its divisors is an integer number (640216).

2^1280431 is an apocalyptic number.

1280431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280431 is an equidigital number, since it uses as much as digits as its factorization.

1280431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1280431 is about 1131.5613107561. The cubic root of 1280431 is about 108.5888899003.

It can be divided in two parts, 1280 and 431, that added together give a triangular number (1711 = T₅₈).

The spelling of 1280431 in words is "one million, two hundred eighty thousand, four hundred thirty-one".