1280361 has 4 divisors (see below), whose sum is σ = 1707152. Its totient is φ = 853572.

The previous prime is 1280333. The next prime is 1280371. The reversal of 1280361 is 1630821.

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: 1630821 = 3 ⋅543607.

It is not a de Polignac number, because 1280361 - 2⁶ = 1280297 is a prime.

It is a D-number.

It is a Duffinian number.

1280361 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1280371) 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, 213391 + ... + 213396.

It is an arithmetic number, because the mean of its divisors is an integer number (426788).

2^1280361 is an apocalyptic number.

It is an amenable number.

1280361 is a deficient number, since it is larger than the sum of its proper divisors (426791).

1280361 is an equidigital number, since it uses as much as digits as its factorization.

1280361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426790.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1280361 is about 1131.5303796187. The cubic root of 1280361 is about 108.5869110456.

The spelling of 1280361 in words is "one million, two hundred eighty thousand, three hundred sixty-one".