1993561 has 2 divisors, whose sum is σ = 1993562. Its totient is φ = 1993560.

The previous prime is 1993553. The next prime is 1993591. The reversal of 1993561 is 1653991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1577536 + 416025 = 1256^2 + 645^2 .

It is a cyclic number.

It is not a de Polignac number, because 1993561 - 2³ = 1993553 is a prime.

It is not a weakly prime, because it can be changed into another prime (1993531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 996780 + 996781.

It is an arithmetic number, because the mean of its divisors is an integer number (996781).

2^1993561 is an apocalyptic number.

It is an amenable number.

1993561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1993561 is an equidigital number, since it uses as much as digits as its factorization.

1993561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7290, while the sum is 34.

The square root of 1993561 is about 1411.9351968132. The cubic root of 1993561 is about 125.8567490986.

The spelling of 1993561 in words is "one million, nine hundred ninety-three thousand, five hundred sixty-one".