61326521 has 4 divisors (see below), whose sum is σ = 61347072. Its totient is φ = 61305972.

The previous prime is 61326491. The next prime is 61326523. The reversal of 61326521 is 12562316.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61326521 - 2¹⁰ = 61325497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61326523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4841 + ... + 12086.

It is an arithmetic number, because the mean of its divisors is an integer number (15336768).

Almost surely, 2^61326521 is an apocalyptic number.

It is an amenable number.

61326521 is a deficient number, since it is larger than the sum of its proper divisors (20551).

61326521 is a wasteful number, since it uses less digits than its factorization.

61326521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20550.

The product of its digits is 2160, while the sum is 26.

The square root of 61326521 is about 7831.1251426599. The cubic root of 61326521 is about 394.3508452970.

Adding to 61326521 its reverse (12562316), we get a palindrome (73888837).

The spelling of 61326521 in words is "sixty-one million, three hundred twenty-six thousand, five hundred twenty-one".