61550079 has 4 divisors (see below), whose sum is σ = 82066776. Its totient is φ = 41033384.

The previous prime is 61550077. The next prime is 61550087. The reversal of 61550079 is 97005516.

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 61550079 - 2¹ = 61550077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61550077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10258344 + ... + 10258349.

It is an arithmetic number, because the mean of its divisors is an integer number (20516694).

Almost surely, 2^61550079 is an apocalyptic number.

61550079 is a deficient number, since it is larger than the sum of its proper divisors (20516697).

61550079 is a wasteful number, since it uses less digits than its factorization.

61550079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20516696.

The product of its (nonzero) digits is 9450, while the sum is 33.

The square root of 61550079 is about 7845.3858413720. The cubic root of 61550079 is about 394.8294494179.

The spelling of 61550079 in words is "sixty-one million, five hundred fifty thousand, seventy-nine".