1280658497 has 4 divisors (see below), whose sum is σ = 1292627376. Its totient is φ = 1268689620.

The previous prime is 1280658479. The next prime is 1280658571. The reversal of 1280658497 is 7948560821.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7948560821 = 3191 ⋅2490931.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1280658497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1280658437) 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, 5984279 + ... + 5984492.

It is an arithmetic number, because the mean of its divisors is an integer number (323156844).

Almost surely, 2^1280658497 is an apocalyptic number.

It is an amenable number.

1280658497 is a deficient number, since it is larger than the sum of its proper divisors (11968879).

1280658497 is a wasteful number, since it uses less digits than its factorization.

1280658497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11968878.

The product of its (nonzero) digits is 967680, while the sum is 50.

The square root of 1280658497 is about 35786.2892320509. The cubic root of 1280658497 is about 1085.9532059535.

The spelling of 1280658497 in words is "one billion, two hundred eighty million, six hundred fifty-eight thousand, four hundred ninety-seven".