1280783253 has 4 divisors (see below), whose sum is σ = 1707711008. Its totient is φ = 853855500.

The previous prime is 1280783249. The next prime is 1280783261. The reversal of 1280783253 is 3523870821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1280783253 - 2² = 1280783249 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280703253) 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, 213463873 + ... + 213463878.

It is an arithmetic number, because the mean of its divisors is an integer number (426927752).

Almost surely, 2^1280783253 is an apocalyptic number.

It is an amenable number.

1280783253 is a deficient number, since it is larger than the sum of its proper divisors (426927755).

1280783253 is an equidigital number, since it uses as much as digits as its factorization.

1280783253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426927754.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 1280783253 is about 35788.0322594020. The cubic root of 1280783253 is about 1085.9884677034.

The spelling of 1280783253 in words is "one billion, two hundred eighty million, seven hundred eighty-three thousand, two hundred fifty-three".