1283457491 has 2 divisors, whose sum is σ = 1283457492. Its totient is φ = 1283457490.

The previous prime is 1283457479. The next prime is 1283457499. The reversal of 1283457491 is 1947543821.

It is a strong prime.

It is an emirp because it is prime and its reverse (1947543821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1283457491 - 2¹⁰ = 1283456467 is a prime.

It is not a weakly prime, because it can be changed into another prime (1283457499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 641728745 + 641728746.

It is an arithmetic number, because the mean of its divisors is an integer number (641728746).

Almost surely, 2^1283457491 is an apocalyptic number.

1283457491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1283457491 is an equidigital number, since it uses as much as digits as its factorization.

1283457491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 1283457491 is about 35825.3749596567. The cubic root of 1283457491 is about 1086.7437796511.

The spelling of 1283457491 in words is "one billion, two hundred eighty-three million, four hundred fifty-seven thousand, four hundred ninety-one".