61364561 has 4 divisors (see below), whose sum is σ = 61449012. Its totient is φ = 61280112.

The previous prime is 61364557. The next prime is 61364573. The reversal of 61364561 is 16546316.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60450625 + 913936 = 7775^2 + 956^2 .

It is a cyclic number.

It is not a de Polignac number, because 61364561 - 2² = 61364557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61364581) 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, 41126 + ... + 42591.

It is an arithmetic number, because the mean of its divisors is an integer number (15362253).

Almost surely, 2^61364561 is an apocalyptic number.

It is an amenable number.

61364561 is a deficient number, since it is larger than the sum of its proper divisors (84451).

61364561 is an equidigital number, since it uses as much as digits as its factorization.

61364561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84450.

The product of its digits is 12960, while the sum is 32.

The square root of 61364561 is about 7833.5535359120. The cubic root of 61364561 is about 394.4323652513.

The spelling of 61364561 in words is "sixty-one million, three hundred sixty-four thousand, five hundred sixty-one".