1251001 has 4 divisors (see below), whose sum is σ = 1268212. Its totient is φ = 1233792.

The previous prime is 1250983. The next prime is 1251011. The reversal of 1251001 is 1001521.

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: 1001521 = 17 ⋅58913.

It can be written as a sum of positive squares in 2 ways, for example, as 251001 + 1000000 = 501^2 + 1000^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251001 - 2⁵ = 1250969 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 (1251011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8496 + ... + 8641.

It is an arithmetic number, because the mean of its divisors is an integer number (317053).

2^1251001 is an apocalyptic number.

It is an amenable number.

1251001 is a deficient number, since it is larger than the sum of its proper divisors (17211).

1251001 is an equidigital number, since it uses as much as digits as its factorization.

1251001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17210.

The product of its (nonzero) digits is 10, while the sum is 10.

The square root of 1251001 is about 1118.4815599732. The cubic root of 1251001 is about 107.7504813511.

Adding to 1251001 its reverse (1001521), we get a palindrome (2252522).

The spelling of 1251001 in words is "one million, two hundred fifty-one thousand, one".