1881971063 has 4 divisors (see below), whose sum is σ = 2150824080. Its totient is φ = 1613118048.

The previous prime is 1881971051. The next prime is 1881971099. The reversal of 1881971063 is 3601791881.

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 1881971063 - 2¹⁰ = 1881970039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881971023) 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, 134426498 + ... + 134426511.

It is an arithmetic number, because the mean of its divisors is an integer number (537706020).

Almost surely, 2^1881971063 is an apocalyptic number.

1881971063 is a deficient number, since it is larger than the sum of its proper divisors (268853017).

1881971063 is an equidigital number, since it uses as much as digits as its factorization.

1881971063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268853016.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 1881971063 is about 43381.6904119699. The cubic root of 1881971063 is about 1234.6323356048.

The spelling of 1881971063 in words is "one billion, eight hundred eighty-one million, nine hundred seventy-one thousand, sixty-three".