1280861455 has 4 divisors (see below), whose sum is σ = 1537033752. Its totient is φ = 1024689160.

The previous prime is 1280861453. The next prime is 1280861489. The reversal of 1280861455 is 5541680821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5541680821 = 3613 ⋅1533817.

It is not a de Polignac number, because 1280861455 - 2¹ = 1280861453 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280861453) 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, 128086141 + ... + 128086150.

It is an arithmetic number, because the mean of its divisors is an integer number (384258438).

Almost surely, 2^1280861455 is an apocalyptic number.

1280861455 is a deficient number, since it is larger than the sum of its proper divisors (256172297).

1280861455 is an equidigital number, since it uses as much as digits as its factorization.

1280861455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256172296.

The product of its (nonzero) digits is 76800, while the sum is 40.

The square root of 1280861455 is about 35789.1248146696. The cubic root of 1280861455 is about 1086.0105699968.

The spelling of 1280861455 in words is "one billion, two hundred eighty million, eight hundred sixty-one thousand, four hundred fifty-five".