61559539 has 4 divisors (see below), whose sum is σ = 61644256. Its totient is φ = 61474824.

The previous prime is 61559503. The next prime is 61559557. The reversal of 61559539 is 93595516.

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

It is a cyclic number.

It is not a de Polignac number, because 61559539 - 2¹⁹ = 61035251 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61559495 and 61559504.

It is not an unprimeable number, because it can be changed into a prime (61559599) 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, 41259 + ... + 42724.

It is an arithmetic number, because the mean of its divisors is an integer number (15411064).

Almost surely, 2^61559539 is an apocalyptic number.

61559539 is a deficient number, since it is larger than the sum of its proper divisors (84717).

61559539 is an equidigital number, since it uses as much as digits as its factorization.

61559539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84716.

The product of its digits is 182250, while the sum is 43.

The square root of 61559539 is about 7845.9887203590. The cubic root of 61559539 is about 394.8496762820.

The spelling of 61559539 in words is "sixty-one million, five hundred fifty-nine thousand, five hundred thirty-nine".