61550621 has 8 divisors (see below), whose sum is σ = 67310688. Its totient is φ = 55818000.

The previous prime is 61550617. The next prime is 61550623. The reversal of 61550621 is 12605516.

61550621 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 a cyclic number.

It is not a de Polignac number, because 61550621 - 2² = 61550617 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 (61550623) 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, 2015 + ... + 11276.

It is an arithmetic number, because the mean of its divisors is an integer number (8413836).

Almost surely, 2^61550621 is an apocalyptic number.

It is an amenable number.

61550621 is a deficient number, since it is larger than the sum of its proper divisors (5760067).

61550621 is a wasteful number, since it uses less digits than its factorization.

61550621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13723.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 61550621 is about 7845.4203838928. The cubic root of 61550621 is about 394.8306083491.

The spelling of 61550621 in words is "sixty-one million, five hundred fifty thousand, six hundred twenty-one".