1280351 has 4 divisors (see below), whose sum is σ = 1285704. Its totient is φ = 1275000.

The previous prime is 1280333. The next prime is 1280371. The reversal of 1280351 is 1530821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1530821 = 523 ⋅2927.

It is a cyclic number.

It is not a de Polignac number, because 1280351 - 2¹⁸ = 1018207 is a prime.

It is an Ulam 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 (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, 2300 + ... + 2801.

It is an arithmetic number, because the mean of its divisors is an integer number (321426).

2^1280351 is an apocalyptic number.

1280351 is a deficient number, since it is larger than the sum of its proper divisors (5353).

1280351 is an equidigital number, since it uses as much as digits as its factorization.

1280351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5352.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1280351 is about 1131.5259608157. The cubic root of 1280351 is about 108.5866283462.

The spelling of 1280351 in words is "one million, two hundred eighty thousand, three hundred fifty-one".