1145121525 has 18 divisors (see below), whose sum is σ = 2051040290. Its totient is φ = 610731360.

The previous prime is 1145121517. The next prime is 1145121529. The reversal of 1145121525 is 5251215411.

It is a happy number.

1145121525 is a `hidden beast` number, since 1 + 14 + 5 + 121 + 525 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 63632529 + 1081488996 = 7977^2 + 32886^2 .

It is not a de Polignac number, because 1145121525 - 2³ = 1145121517 is a prime.

It is a super-2 number, since 2×1145121525² = 2622606614036651250, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145121529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2544490 + ... + 2544939.

Almost surely, 2^1145121525 is an apocalyptic number.

1145121525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1145121525 is a deficient number, since it is larger than the sum of its proper divisors (905918765).

1145121525 is a wasteful number, since it uses less digits than its factorization.

1145121525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5089445 (or 5089437 counting only the distinct ones).

The product of its digits is 2000, while the sum is 27.

The square root of 1145121525 is about 33839.6442800453. The cubic root of 1145121525 is about 1046.2059671520.

Adding to 1145121525 its reverse (5251215411), we get a palindrome (6396336936).

The spelling of 1145121525 in words is "one billion, one hundred forty-five million, one hundred twenty-one thousand, five hundred twenty-five".