60555991 has 4 divisors (see below), whose sum is σ = 60579792. Its totient is φ = 60532192.

The previous prime is 60555959. The next prime is 60556039. The reversal of 60555991 is 19955506.

60555991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 60555991 - 2⁵ = 60555959 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (60553991) 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 3 ways as a sum of consecutive naturals, for example, 7555 + ... + 13348.

It is an arithmetic number, because the mean of its divisors is an integer number (15144948).

Almost surely, 2^60555991 is an apocalyptic number.

60555991 is a deficient number, since it is larger than the sum of its proper divisors (23801).

60555991 is a wasteful number, since it uses less digits than its factorization.

60555991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23800.

The product of its (nonzero) digits is 60750, while the sum is 40.

The square root of 60555991 is about 7781.7729984882. The cubic root of 60555991 is about 392.6922876230.

The spelling of 60555991 in words is "sixty million, five hundred fifty-five thousand, nine hundred ninety-one".