1565784481 has 4 divisors (see below), whose sum is σ = 1566016192. Its totient is φ = 1565552772.

The previous prime is 1565784469. The next prime is 1565784491. The reversal of 1565784481 is 1844875651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1565784481 - 2⁹ = 1565783969 is a prime.

It is a super-2 number, since 2×1565784481² = 4903362081880878722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1565784401) 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, 105405 + ... + 119338.

It is an arithmetic number, because the mean of its divisors is an integer number (391504048).

Almost surely, 2^1565784481 is an apocalyptic number.

It is an amenable number.

1565784481 is a deficient number, since it is larger than the sum of its proper divisors (231711).

1565784481 is an equidigital number, since it uses as much as digits as its factorization.

1565784481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231710.

The product of its digits is 1075200, while the sum is 49.

The square root of 1565784481 is about 39569.9947055847. The cubic root of 1565784481 is about 1161.2097172371.

The spelling of 1565784481 in words is "one billion, five hundred sixty-five million, seven hundred eighty-four thousand, four hundred eighty-one".