1281001 has 4 divisors (see below), whose sum is σ = 1356372. Its totient is φ = 1205632.

The previous prime is 1280989. The next prime is 1281029. The reversal of 1281001 is 1001821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1104601 + 176400 = 1051^2 + 420^2 .

It is a cyclic number.

It is not a de Polignac number, because 1281001 - 2⁵ = 1280969 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 (1281041) 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, 37660 + ... + 37693.

It is an arithmetic number, because the mean of its divisors is an integer number (339093).

2^1281001 is an apocalyptic number.

It is an amenable number.

1281001 is a deficient number, since it is larger than the sum of its proper divisors (75371).

1281001 is an equidigital number, since it uses as much as digits as its factorization.

1281001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75370.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1281001 is about 1131.8131471228. The cubic root of 1281001 is about 108.6050007476.

Adding to 1281001 its reverse (1001821), we get a palindrome (2282822).

The spelling of 1281001 in words is "one million, two hundred eighty-one thousand, one".