1565545427 has 4 divisors (see below), whose sum is σ = 1567036056. Its totient is φ = 1564054800.

The previous prime is 1565545391. The next prime is 1565545441. The reversal of 1565545427 is 7245455651.

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 1565545427 - 2⁶ = 1565545363 is a prime.

It is a super-2 number, since 2×1565545427² = 4901864968001224658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1565545127) 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, 743738 + ... + 745839.

It is an arithmetic number, because the mean of its divisors is an integer number (391759014).

Almost surely, 2^1565545427 is an apocalyptic number.

1565545427 is a deficient number, since it is larger than the sum of its proper divisors (1490629).

1565545427 is a wasteful number, since it uses less digits than its factorization.

1565545427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1490628.

The product of its digits is 840000, while the sum is 44.

The square root of 1565545427 is about 39566.9739429237. The cubic root of 1565545427 is about 1161.1506188620.

The spelling of 1565545427 in words is "one billion, five hundred sixty-five million, five hundred forty-five thousand, four hundred twenty-seven".