1321961 has 2 divisors, whose sum is σ = 1321962. Its totient is φ = 1321960.
The previous prime is 1321951. The next prime is 1321981. The reversal of 1321961 is 1691231.
It is a happy number.
1321961 is nontrivially palindromic in base 3.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 1308736 + 13225 = 1144^2 + 115^2 .
It is an emirp because it is prime and its reverse (1691231) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 1321961 - 26 = 1321897 is a prime.
It is not a weakly prime, because it can be changed into another prime (1321951) 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 as a sum of consecutive naturals, namely, 660980 + 660981.
It is an arithmetic number, because the mean of its divisors is an integer number (660981).
21321961 is an apocalyptic number.
It is an amenable number.
1321961 is a deficient number, since it is larger than the sum of its proper divisors (1).
1321961 is an equidigital number, since it uses as much as digits as its factorization.
1321961 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 324, while the sum is 23.
The square root of 1321961 is about 1149.7656282913. The cubic root of 1321961 is about 109.7504259163.
It can be divided in two parts, 132 and 1961, that multiplied together give a palindrome (258852).
The spelling of 1321961 in words is "one million, three hundred twenty-one thousand, nine hundred sixty-one".
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