1223516525 has 144 divisors (see below), whose sum is σ = 2076295680. Its totient is φ = 705600000.

The previous prime is 1223516519. The next prime is 1223516527. The reversal of 1223516525 is 5256153221.

It is not a de Polignac number, because 1223516525 - 2⁴ = 1223516509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1223516491 and 1223516500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223516527) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 12113975 + ... + 12114075.

It is an arithmetic number, because the mean of its divisors is an integer number (14418720).

Almost surely, 2^1223516525 is an apocalyptic number.

It is an amenable number.

1223516525 is a deficient number, since it is larger than the sum of its proper divisors (852779155).

1223516525 is a wasteful number, since it uses less digits than its factorization.

1223516525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196 (or 184 counting only the distinct ones).

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

The square root of 1223516525 is about 34978.8010800828. The cubic root of 1223516525 is about 1069.5553878170. Note that the first 3 decimals are identical.

Adding to 1223516525 its reverse (5256153221), we get a palindrome (6479669746).

The spelling of 1223516525 in words is "one billion, two hundred twenty-three million, five hundred sixteen thousand, five hundred twenty-five".