61564613 has 8 divisors (see below), whose sum is σ = 67287456. Its totient is φ = 55862800.

The previous prime is 61564609. The next prime is 61564619. The reversal of 61564613 is 31646516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61564613 - 2² = 61564609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61564613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61564619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1223 + ... + 11163.

It is an arithmetic number, because the mean of its divisors is an integer number (8410932).

Almost surely, 2^61564613 is an apocalyptic number.

It is an amenable number.

61564613 is a deficient number, since it is larger than the sum of its proper divisors (5722843).

61564613 is a wasteful number, since it uses less digits than its factorization.

61564613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10515.

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

The square root of 61564613 is about 7846.3120636386. The cubic root of 61564613 is about 394.8605243826.

The spelling of 61564613 in words is "sixty-one million, five hundred sixty-four thousand, six hundred thirteen".