1311001 has 2 divisors, whose sum is σ = 1311002. Its totient is φ = 1311000.

The previous prime is 1310999. The next prime is 1311029. The reversal of 1311001 is 1001131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 678976 + 632025 = 824^2 + 795^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311001 - 2¹ = 1310999 is a prime.

Together with 1310999, it forms a pair of twin primes.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1311031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655500 + 655501.

It is an arithmetic number, because the mean of its divisors is an integer number (655501).

2^1311001 is an apocalyptic number.

It is an amenable number.

1311001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311001 is an equidigital number, since it uses as much as digits as its factorization.

1311001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3, while the sum is 7.

The square root of 1311001 is about 1144.9895196027. The cubic root of 1311001 is about 109.4462807193.

Adding to 1311001 its reverse (1001131), we get a palindrome (2312132).

It can be divided in two parts, 131 and 1001, that multiplied together give a palindrome (131131).

The spelling of 1311001 in words is "one million, three hundred eleven thousand, one".