51646985 has 8 divisors (see below), whose sum is σ = 66743880. Its totient is φ = 38139264.

The previous prime is 51646951. The next prime is 51647009. The reversal of 51646985 is 58964615.

It can be written as a sum of positive squares in 4 ways, for example, as 1336336 + 50310649 = 1156^2 + 7093^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 51646985 - 2¹⁰ = 51645961 is a prime.

It is a super-2 number, since 2×51646985² = 5334822119180450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397220 + ... + 397349.

It is an arithmetic number, because the mean of its divisors is an integer number (8342985).

Almost surely, 2^51646985 is an apocalyptic number.

It is an amenable number.

51646985 is a deficient number, since it is larger than the sum of its proper divisors (15096895).

51646985 is a wasteful number, since it uses less digits than its factorization.

51646985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794587.

The product of its digits is 259200, while the sum is 44.

The square root of 51646985 is about 7186.5836807206. The cubic root of 51646985 is about 372.4045609285.

The spelling of 51646985 in words is "fifty-one million, six hundred forty-six thousand, nine hundred eighty-five".