1881563 has 4 divisors (see below), whose sum is σ = 1898328. Its totient is φ = 1864800.

The previous prime is 1881559. The next prime is 1881587. The reversal of 1881563 is 3651881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3651881 = 1601 ⋅2281.

It is a cyclic number.

It is not a de Polignac number, because 1881563 - 2² = 1881559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1881533) 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, 8213 + ... + 8438.

It is an arithmetic number, because the mean of its divisors is an integer number (474582).

2^1881563 is an apocalyptic number.

1881563 is a deficient number, since it is larger than the sum of its proper divisors (16765).

1881563 is a wasteful number, since it uses less digits than its factorization.

1881563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16764.

The product of its digits is 5760, while the sum is 32.

The square root of 1881563 is about 1371.7007691184. The cubic root of 1881563 is about 123.4543095091.

The spelling of 1881563 in words is "one million, eight hundred eighty-one thousand, five hundred sixty-three".