1961321 has 2 divisors, whose sum is σ = 1961322. Its totient is φ = 1961320.

The previous prime is 1961257. The next prime is 1961327. The reversal of 1961321 is 1231691.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1413721 + 547600 = 1189^2 + 740^2 .

It is an emirp because it is prime and its reverse (1231691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1961321 - 2⁶ = 1961257 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1961327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980660 + 980661.

It is an arithmetic number, because the mean of its divisors is an integer number (980661).

2^1961321 is an apocalyptic number.

It is an amenable number.

1961321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961321 is an equidigital number, since it uses as much as digits as its factorization.

1961321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 23.

The square root of 1961321 is about 1400.4717062476. The cubic root of 1961321 is about 125.1746039940.

The spelling of 1961321 in words is "one million, nine hundred sixty-one thousand, three hundred twenty-one".