61599561 has 8 divisors (see below), whose sum is σ = 84352704. Its totient is φ = 39956400.

The previous prime is 61599557. The next prime is 61599581. The reversal of 61599561 is 16599516.

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

It is not a de Polignac number, because 61599561 - 2² = 61599557 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61599541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277365 + ... + 277586.

It is an arithmetic number, because the mean of its divisors is an integer number (10544088).

Almost surely, 2^61599561 is an apocalyptic number.

It is an amenable number.

61599561 is a deficient number, since it is larger than the sum of its proper divisors (22753143).

61599561 is a wasteful number, since it uses less digits than its factorization.

61599561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554991.

The product of its digits is 72900, while the sum is 42.

The square root of 61599561 is about 7848.5387812000. The cubic root of 61599561 is about 394.9352262531.

The spelling of 61599561 in words is "sixty-one million, five hundred ninety-nine thousand, five hundred sixty-one".