1565485871 has 2 divisors, whose sum is σ = 1565485872. Its totient is φ = 1565485870.

The previous prime is 1565485787. The next prime is 1565485879. The reversal of 1565485871 is 1785845651.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1565485871 - 2¹⁰ = 1565484847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1565485879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 782742935 + 782742936.

It is an arithmetic number, because the mean of its divisors is an integer number (782742936).

Almost surely, 2^1565485871 is an apocalyptic number.

1565485871 is a deficient number, since it is larger than the sum of its proper divisors (1).

1565485871 is an equidigital number, since it uses as much as digits as its factorization.

1565485871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344000, while the sum is 50.

The square root of 1565485871 is about 39566.2213384094. The cubic root of 1565485871 is about 1161.1358946298.

The spelling of 1565485871 in words is "one billion, five hundred sixty-five million, four hundred eighty-five thousand, eight hundred seventy-one".