60561991 has 12 divisors (see below), whose sum is σ = 71951328. Its totient is φ = 50803872.

The previous prime is 60561913. The next prime is 60562001. The reversal of 60561991 is 19916506.

60561991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 60561991 - 2¹³ = 60553799 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 60561991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (60561901) 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 11 ways as a sum of consecutive naturals, for example, 10846 + ... + 15451.

It is an arithmetic number, because the mean of its divisors is an integer number (5995944).

Almost surely, 2^60561991 is an apocalyptic number.

60561991 is a deficient number, since it is larger than the sum of its proper divisors (11389337).

60561991 is a wasteful number, since it uses less digits than its factorization.

60561991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26358 (or 26351 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 60561991 is about 7782.1585051964. The cubic root of 60561991 is about 392.7052567550.

The spelling of 60561991 in words is "sixty million, five hundred sixty-one thousand, nine hundred ninety-one".