51061985 has 8 divisors (see below), whose sum is σ = 65987880. Its totient is φ = 37707264.

The previous prime is 51061957. The next prime is 51062003. The reversal of 51061985 is 58916015.

It can be written as a sum of positive squares in 4 ways, for example, as 1373584 + 49688401 = 1172^2 + 7049^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51061985 is a prime.

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 392720 + ... + 392849.

It is an arithmetic number, because the mean of its divisors is an integer number (8248485).

Almost surely, 2^51061985 is an apocalyptic number.

It is an amenable number.

51061985 is a deficient number, since it is larger than the sum of its proper divisors (14925895).

51061985 is a wasteful number, since it uses less digits than its factorization.

51061985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785587.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 51061985 is about 7145.7669287488. The cubic root of 51061985 is about 370.9931559828.

The spelling of 51061985 in words is "fifty-one million, sixty-one thousand, nine hundred eighty-five".