1225123565 has 16 divisors (see below), whose sum is σ = 1521939456. Its totient is φ = 945753600.

The previous prime is 1225123519. The next prime is 1225123579. The reversal of 1225123565 is 5653215221.

It is not a de Polignac number, because 1225123565 - 2²⁰ = 1224074989 is a prime.

It is a Duffinian 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, 43520 + ... + 65910.

It is an arithmetic number, because the mean of its divisors is an integer number (95121216).

Almost surely, 2^1225123565 is an apocalyptic number.

It is an amenable number.

1225123565 is a deficient number, since it is larger than the sum of its proper divisors (296815891).

1225123565 is a wasteful number, since it uses less digits than its factorization.

1225123565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22780.

The product of its digits is 18000, while the sum is 32.

The square root of 1225123565 is about 35001.7651697739. The cubic root of 1225123565 is about 1070.0234556829.

Adding to 1225123565 its reverse (5653215221), we get a palindrome (6878338786).

The spelling of 1225123565 in words is "one billion, two hundred twenty-five million, one hundred twenty-three thousand, five hundred sixty-five".