51061986 has 12 divisors (see below), whose sum is σ = 110634342. Its totient is φ = 17020656.

The previous prime is 51061957. The next prime is 51062003. The reversal of 51061986 is 68916015.

51061986 is a `hidden beast` number, since 510 + 61 + 9 + 86 = 666.

It can be written as a sum of positive squares in only one way, i.e., 44635761 + 6426225 = 6681^2 + 2535^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51061986.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1418371 + ... + 1418406.

Almost surely, 2^51061986 is an apocalyptic number.

51061986 is an abundant number, since it is smaller than the sum of its proper divisors (59572356).

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

51061986 is a wasteful number, since it uses less digits than its factorization.

51061986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2836785 (or 2836782 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 51061986 is about 7145.7669987203. The cubic root of 51061986 is about 370.9931584046.

The spelling of 51061986 in words is "fifty-one million, sixty-one thousand, nine hundred eighty-six".