61330561 has 4 divisors (see below), whose sum is σ = 61396272. Its totient is φ = 61264852.

The previous prime is 61330519. The next prime is 61330567. The reversal of 61330561 is 16503316.

61330561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 61330561 - 2²¹ = 59233409 is a prime.

It is a super-2 number, since 2×61330561² = 7522875425149442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61330567) 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 3 ways as a sum of consecutive naturals, for example, 31435 + ... + 33328.

It is an arithmetic number, because the mean of its divisors is an integer number (15349068).

Almost surely, 2^61330561 is an apocalyptic number.

It is an amenable number.

61330561 is a deficient number, since it is larger than the sum of its proper divisors (65711).

61330561 is an equidigital number, since it uses as much as digits as its factorization.

61330561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65710.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 61330561 is about 7831.3830834662. The cubic root of 61330561 is about 394.3595046416.

Adding to 61330561 its reverse (16503316), we get a palindrome (77833877).

The spelling of 61330561 in words is "sixty-one million, three hundred thirty thousand, five hundred sixty-one".