1027155565 has 4 divisors (see below), whose sum is σ = 1232586684. Its totient is φ = 821724448.

The previous prime is 1027155541. The next prime is 1027155583. The reversal of 1027155565 is 5655517201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5655517201 = 2011 ⋅2812291.

It can be written as a sum of positive squares in 2 ways, for example, as 279625284 + 747530281 = 16722^2 + 27341^2 .

It is a cyclic number.

It is not a de Polignac number, because 1027155565 - 2⁹ = 1027155053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102715552 + ... + 102715561.

It is an arithmetic number, because the mean of its divisors is an integer number (308146671).

Almost surely, 2^1027155565 is an apocalyptic number.

It is an amenable number.

1027155565 is a deficient number, since it is larger than the sum of its proper divisors (205431119).

1027155565 is an equidigital number, since it uses as much as digits as its factorization.

1027155565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205431118.

The product of its (nonzero) digits is 52500, while the sum is 37.

The square root of 1027155565 is about 32049.2677763471. The cubic root of 1027155565 is about 1008.9711331016.

The spelling of 1027155565 in words is "one billion, twenty-seven million, one hundred fifty-five thousand, five hundred sixty-five".