1210001 has 4 divisors (see below), whose sum is σ = 1303092. Its totient is φ = 1116912.

The previous prime is 1209979. The next prime is 1210003. The reversal of 1210001 is 1000121.

It is a happy number.

It is a Cunningham number, because it is equal to 1100²+1.

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 179776 + 1030225 = 424^2 + 1015^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210001 - 2¹⁴ = 1193617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210003) 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, 46526 + ... + 46551.

It is an arithmetic number, because the mean of its divisors is an integer number (325773).

2^1210001 is an apocalyptic number.

It is an amenable number.

1210001 is a deficient number, since it is larger than the sum of its proper divisors (93091).

1210001 is an equidigital number, since it uses as much as digits as its factorization.

1210001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93090.

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 1210001 is about 1100.0004545454. Note that the first 3 decimals coincide. The cubic root of 1210001 is about 106.5602530321.

Adding to 1210001 its reverse (1000121), we get a palindrome (2210122).

Multiplying 1210001 by its reverse (1000121), we get a palindrome (1210147410121).

The spelling of 1210001 in words is "one million, two hundred ten thousand, one".