1213504525 has 12 divisors (see below), whose sum is σ = 1505344500. Its totient is φ = 970417280.

The previous prime is 1213504493. The next prime is 1213504529. The reversal of 1213504525 is 5254053121.

It can be written as a sum of positive squares in 6 ways, for example, as 482505156 + 730999369 = 21966^2 + 27037^2 .

It is not a de Polignac number, because 1213504525 - 2⁵ = 1213504493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213504493 and 1213504502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213504529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66051 + ... + 82399.

It is an arithmetic number, because the mean of its divisors is an integer number (125445375).

Almost surely, 2^1213504525 is an apocalyptic number.

It is an amenable number.

1213504525 is a deficient number, since it is larger than the sum of its proper divisors (291839975).

1213504525 is a wasteful number, since it uses less digits than its factorization.

1213504525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19328 (or 19323 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 1213504525 is about 34835.3918450762. The cubic root of 1213504525 is about 1066.6300136602.

Adding to 1213504525 its reverse (5254053121), we get a palindrome (6467557646).

The spelling of 1213504525 in words is "one billion, two hundred thirteen million, five hundred four thousand, five hundred twenty-five".