1213001 has 4 divisors (see below), whose sum is σ = 1284372. Its totient is φ = 1141632.

The previous prime is 1212989. The next prime is 1213007. The reversal of 1213001 is 1003121.

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 1123600 + 89401 = 1060^2 + 299^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213001 is a prime.

It is a super-3 number, since 3×1213001³ = 5354325033331917003, which contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213001.

It is not an unprimeable number, because it can be changed into a prime (1213007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35660 + ... + 35693.

It is an arithmetic number, because the mean of its divisors is an integer number (321093).

2^1213001 is an apocalyptic number.

It is an amenable number.

1213001 is a deficient number, since it is larger than the sum of its proper divisors (71371).

1213001 is an equidigital number, since it uses as much as digits as its factorization.

1213001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71370.

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 1213001 is about 1101.3632461636. The cubic root of 1213001 is about 106.6482466022.

Adding to 1213001 its reverse (1003121), we get a palindrome (2216122).

The spelling of 1213001 in words is "one million, two hundred thirteen thousand, one".