1201311 has 10 divisors (see below), whose sum is σ = 1794672. Its totient is φ = 800820.

The previous prime is 1201309. The next prime is 1201327. The reversal of 1201311 is 1131021.

It is not a de Polignac number, because 1201311 - 2¹ = 1201309 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1201293 and 1201302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 7335 + ... + 7496.

2^1201311 is an apocalyptic number.

1201311 is a deficient number, since it is larger than the sum of its proper divisors (593361).

1201311 is an equidigital number, since it uses as much as digits as its factorization.

1201311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14843 (or 14834 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 1201311 is about 1096.0433385592. The cubic root of 1201311 is about 106.3045413170.

Adding to 1201311 its reverse (1131021), we get a palindrome (2332332).

It can be divided in two parts, 120 and 1311, that added together give a triangular number (1431 = T₅₃).

The spelling of 1201311 in words is "one million, two hundred one thousand, three hundred eleven".