1231001 has 2 divisors, whose sum is σ = 1231002. Its totient is φ = 1231000.

The previous prime is 1230997. The next prime is 1231003. The reversal of 1231001 is 1001321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 739600 + 491401 = 860^2 + 701^2 .

It is an emirp because it is prime and its reverse (1001321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231001 - 2² = 1230997 is a prime.

Together with 1231003, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1231001.

It is not a weakly prime, because it can be changed into another prime (1231003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615500 + 615501.

It is an arithmetic number, because the mean of its divisors is an integer number (615501).

2^1231001 is an apocalyptic number.

It is an amenable number.

1231001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231001 is an equidigital number, since it uses as much as digits as its factorization.

1231001 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1231001 is about 1109.5048445140. The cubic root of 1231001 is about 107.1731844731.

Adding to 1231001 its reverse (1001321), we get a palindrome (2232322).

It can be divided in two parts, 12 and 31001, that added together give a palindrome (31013).

The spelling of 1231001 in words is "one million, two hundred thirty-one thousand, one".