61381986 has 48 divisors (see below), whose sum is σ = 130437216. Its totient is φ = 19252288.

The previous prime is 61381937. The next prime is 61381993. The reversal of 61381986 is 68918316.

61381986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 263326 + ... + 263558.

It is an arithmetic number, because the mean of its divisors is an integer number (2717442).

Almost surely, 2^61381986 is an apocalyptic number.

61381986 is an abundant number, since it is smaller than the sum of its proper divisors (69055230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61381986 is a wasteful number, since it uses less digits than its factorization.

61381986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367 (or 344 counting only the distinct ones).

The product of its digits is 62208, while the sum is 42.

The square root of 61381986 is about 7834.6656597458. The cubic root of 61381986 is about 394.4696958832.

The spelling of 61381986 in words is "sixty-one million, three hundred eighty-one thousand, nine hundred eighty-six".