61564361 has 16 divisors (see below), whose sum is σ = 67962240. Its totient is φ = 55507200.

The previous prime is 61564339. The next prime is 61564369. The reversal of 61564361 is 16346516.

61564361 = 1895² + 1896² + ... + 1911².

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61564361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61564369) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74030 + ... + 74856.

It is an arithmetic number, because the mean of its divisors is an integer number (4247640).

Almost surely, 2^61564361 is an apocalyptic number.

It is an amenable number.

61564361 is a deficient number, since it is larger than the sum of its proper divisors (6397879).

61564361 is a wasteful number, since it uses less digits than its factorization.

61564361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024.

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

The square root of 61564361 is about 7846.2960051224. The cubic root of 61564361 is about 394.8599856262.

The spelling of 61564361 in words is "sixty-one million, five hundred sixty-four thousand, three hundred sixty-one".