61391559 has 8 divisors (see below), whose sum is σ = 83197552. Its totient is φ = 40256640.

The previous prime is 61391479. The next prime is 61391567. The reversal of 61391559 is 95519316.

61391559 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 61391559 - 2⁹ = 61391047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61391159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167554 + ... + 167919.

It is an arithmetic number, because the mean of its divisors is an integer number (10399694).

Almost surely, 2^61391559 is an apocalyptic number.

61391559 is a deficient number, since it is larger than the sum of its proper divisors (21805993).

61391559 is a wasteful number, since it uses less digits than its factorization.

61391559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335537.

The product of its digits is 36450, while the sum is 39.

The square root of 61391559 is about 7835.2765745697. The cubic root of 61391559 is about 394.4902016936.

The spelling of 61391559 in words is "sixty-one million, three hundred ninety-one thousand, five hundred fifty-nine".