1968561 has 12 divisors (see below), whose sum is σ = 3249792. Its totient is φ = 1124856.

The previous prime is 1968541. The next prime is 1968563. The reversal of 1968561 is 1658691.

1968561 is a `hidden beast` number, since 1 + 96 + 8 + 561 = 666.

It is not a de Polignac number, because 1968561 - 2¹³ = 1960369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1968563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15561 + ... + 15686.

It is an arithmetic number, because the mean of its divisors is an integer number (270816).

2^1968561 is an apocalyptic number.

It is an amenable number.

1968561 is a deficient number, since it is larger than the sum of its proper divisors (1281231).

1968561 is a wasteful number, since it uses less digits than its factorization.

1968561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31260 (or 31257 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 1968561 is about 1403.0541685908. The cubic root of 1968561 is about 125.3284376074.

The spelling of 1968561 in words is "one million, nine hundred sixty-eight thousand, five hundred sixty-one".