1051205565 has 16 divisors (see below), whose sum is σ = 1683233856. Its totient is φ = 560208000.

The previous prime is 1051205527. The next prime is 1051205599. The reversal of 1051205565 is 5655021501.

It is not a de Polignac number, because 1051205565 - 2¹² = 1051201469 is a prime.

It is a super-2 number, since 2×1051205565² = 2210066279773938450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6711 + ... + 46340.

It is an arithmetic number, because the mean of its divisors is an integer number (105202116).

Almost surely, 2^1051205565 is an apocalyptic number.

1051205565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1051205565 is a deficient number, since it is larger than the sum of its proper divisors (632028291).

1051205565 is a wasteful number, since it uses less digits than its factorization.

1051205565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54380.

The product of its (nonzero) digits is 7500, while the sum is 30.

The square root of 1051205565 is about 32422.3004273293. The cubic root of 1051205565 is about 1016.7852022799.

It can be divided in two parts, 105120 and 5565, that added together give a triangular number (110685 = T₄₇₀).

The spelling of 1051205565 in words is "one billion, fifty-one million, two hundred five thousand, five hundred sixty-five".