1245534121225 has 9 divisors (see below), whose sum is σ = 1544469229767. Its totient is φ = 996422832840.

The previous prime is 1245534121219. The next prime is 1245534121229. The reversal of 1245534121225 is 5221214355421.

The square root of 1245534121225 is 1116035.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 448392283641 + 797141837584 = 669621^2 + 892828^2 .

It is not a de Polignac number, because 1245534121225 - 2¹⁷ = 1245533990153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1245534121229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5468572 + ... + 5691778.

Almost surely, 2^{1245534121225} is an apocalyptic number.

1245534121225 is the 1116035-th square number.

1245534121225 is the 558018-th centered octagonal number.

It is an amenable number.

1245534121225 is a deficient number, since it is larger than the sum of its proper divisors (298935108542).

1245534121225 is an frugal number, since it uses more digits than its factorization.

1245534121225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446424 (or 223212 counting only the distinct ones).

The product of its digits is 96000, while the sum is 37.

Adding to 1245534121225 its reverse (5221214355421), we get a palindrome (6466748476646).

The spelling of 1245534121225 in words is "one trillion, two hundred forty-five billion, five hundred thirty-four million, one hundred twenty-one thousand, two hundred twenty-five".