61135521 has 16 divisors (see below), whose sum is σ = 86384640. Its totient is φ = 38350800.

The previous prime is 61135517. The next prime is 61135531. The reversal of 61135521 is 12553116.

61135521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61135521 - 2² = 61135517 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61135491 and 61135500.

It is not an unprimeable number, because it can be changed into a prime (61135531) 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 15 ways as a sum of consecutive naturals, for example, 5056 + ... + 12158.

It is an arithmetic number, because the mean of its divisors is an integer number (5399040).

Almost surely, 2^61135521 is an apocalyptic number.

It is an amenable number.

61135521 is a deficient number, since it is larger than the sum of its proper divisors (25249119).

61135521 is a wasteful number, since it uses less digits than its factorization.

61135521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7276.

The product of its digits is 900, while the sum is 24.

The square root of 61135521 is about 7818.9207055706. The cubic root of 61135521 is about 393.9410207438.

Adding to 61135521 its reverse (12553116), we get a palindrome (73688637).

The spelling of 61135521 in words is "sixty-one million, one hundred thirty-five thousand, five hundred twenty-one".