1213020525 has 24 divisors (see below), whose sum is σ = 2006568000. Its totient is φ = 646608640.

The previous prime is 1213020521. The next prime is 1213020527. The reversal of 1213020525 is 5250203121.

It is not a de Polignac number, because 1213020525 - 2² = 1213020521 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213020521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 222229 + ... + 227621.

It is an arithmetic number, because the mean of its divisors is an integer number (83607000).

Almost surely, 2^1213020525 is an apocalyptic number.

1213020525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1213020525 is a deficient number, since it is larger than the sum of its proper divisors (793547475).

1213020525 is a wasteful number, since it uses less digits than its factorization.

1213020525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8405 (or 8400 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 1213020525 is about 34828.4441943650. Note that the first 3 decimals coincide. The cubic root of 1213020525 is about 1066.4881881827.

Adding to 1213020525 its reverse (5250203121), we get a palindrome (6463223646).

The spelling of 1213020525 in words is "one billion, two hundred thirteen million, twenty thousand, five hundred twenty-five".