61310561 has 16 divisors (see below), whose sum is σ = 68612544. Its totient is φ = 54419904.

The previous prime is 61310531. The next prime is 61310569. The reversal of 61310561 is 16501316.

It is a happy number.

61310561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61310561 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61310569) 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, 36635 + ... + 38271.

It is an arithmetic number, because the mean of its divisors is an integer number (4288284).

Almost surely, 2^61310561 is an apocalyptic number.

It is an amenable number.

61310561 is a deficient number, since it is larger than the sum of its proper divisors (7301983).

61310561 is a wasteful number, since it uses less digits than its factorization.

61310561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1760.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 61310561 is about 7830.1060656929. The cubic root of 61310561 is about 394.3166328799.

Adding to 61310561 its reverse (16501316), we get a palindrome (77811877).

The spelling of 61310561 in words is "sixty-one million, three hundred ten thousand, five hundred sixty-one".