1971563 has 4 divisors (see below), whose sum is σ = 2150808. Its totient is φ = 1792320.

The previous prime is 1971553. The next prime is 1971577. The reversal of 1971563 is 3651791.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1971563 - 2¹⁴ = 1955179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1971503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89606 + ... + 89627.

It is an arithmetic number, because the mean of its divisors is an integer number (537702).

2^1971563 is an apocalyptic number.

1971563 is a deficient number, since it is larger than the sum of its proper divisors (179245).

1971563 is a wasteful number, since it uses less digits than its factorization.

1971563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179244.

The product of its digits is 5670, while the sum is 32.

The square root of 1971563 is about 1404.1235700607. The cubic root of 1971563 is about 125.3921126949.

The spelling of 1971563 in words is "one million, nine hundred seventy-one thousand, five hundred sixty-three".