1222723565 has 16 divisors (see below), whose sum is σ = 1712558592. Its totient is φ = 820598784.

The previous prime is 1222723559. The next prime is 1222723577. The reversal of 1222723565 is 5653272221.

It is a cyclic number.

It is not a de Polignac number, because 1222723565 - 2¹⁶ = 1222658029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 370004 + ... + 373293.

It is an arithmetic number, because the mean of its divisors is an integer number (107034912).

Almost surely, 2^1222723565 is an apocalyptic number.

It is an amenable number.

1222723565 is a deficient number, since it is larger than the sum of its proper divisors (489835027).

1222723565 is an equidigital number, since it uses as much as digits as its factorization.

1222723565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743356.

The product of its digits is 50400, while the sum is 35.

The square root of 1222723565 is about 34967.4643776182. The cubic root of 1222723565 is about 1069.3242785758.

Adding to 1222723565 its reverse (5653272221), we get a palindrome (6875995786).

The spelling of 1222723565 in words is "one billion, two hundred twenty-two million, seven hundred twenty-three thousand, five hundred sixty-five".