1965521 has 2 divisors, whose sum is σ = 1965522. Its totient is φ = 1965520.

The previous prime is 1965517. The next prime is 1965527. The reversal of 1965521 is 1255691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1784896 + 180625 = 1336^2 + 425^2 .

It is a cyclic number.

It is not a de Polignac number, because 1965521 - 2² = 1965517 is a prime.

It is not a weakly prime, because it can be changed into another prime (1965527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 982760 + 982761.

It is an arithmetic number, because the mean of its divisors is an integer number (982761).

2^1965521 is an apocalyptic number.

It is an amenable number.

1965521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1965521 is an equidigital number, since it uses as much as digits as its factorization.

1965521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 29.

The square root of 1965521 is about 1401.9703991169. The cubic root of 1965521 is about 125.2638905024.

The spelling of 1965521 in words is "one million, nine hundred sixty-five thousand, five hundred twenty-one".