1001311 has 2 divisors, whose sum is σ = 1001312.
Its totient is φ = 1001310.
The previous prime is 1001303. The next prime is 1001321. The reversal of 1001311 is 1131001.
Adding to 1001311 its reverse (1131001), we get a palindrome (2132312).
It is a happy number.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 1001311 - 23 = 1001303 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 1001294 and 1001303.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1001321) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500655 + 500656.
It is an arithmetic number, because the mean of its divisors is an integer number (500656).
21001311 is an apocalyptic number.
1001311 is a deficient number, since it is larger than the sum of its proper divisors (1).
1001311 is an equidigital number, since it uses as much as digits as its factorization.
1001311 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 1001311 is about 1000.6552853006.
The cubic root of 1001311 is about 100.0436809170.
The spelling of 1001311 in words is "one million, one thousand, three hundred eleven".