1281431 has 2 divisors, whose sum is σ = 1281432. Its totient is φ = 1281430.

The previous prime is 1281407. The next prime is 1281433. The reversal of 1281431 is 1341821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1281431 - 2⁶ = 1281367 is a prime.

It is a super-2 number, since 2×1281431² = 3284130815522, which contains 22 as substring.

Together with 1281433, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1281433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640715 + 640716.

It is an arithmetic number, because the mean of its divisors is an integer number (640716).

2^1281431 is an apocalyptic number.

1281431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281431 is an equidigital number, since it uses as much as digits as its factorization.

1281431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 20.

The square root of 1281431 is about 1132.0030918686. The cubic root of 1281431 is about 108.6171513824.

The spelling of 1281431 in words is "one million, two hundred eighty-one thousand, four hundred thirty-one".